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Beaven CM, Uiga L, Hébert-Losier K. Positive effects of blue light on motor coordination in older adults: A pilot study. APPLIED ERGONOMICS 2024; 114:104156. [PMID: 37866103 DOI: 10.1016/j.apergo.2023.104156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 09/24/2023] [Accepted: 10/13/2023] [Indexed: 10/24/2023]
Abstract
PURPOSE Falls are a risk factor for mortality in older adults. Lighting interventions can improve cognitive and motor task performance, but the effect on postural control with relevance to falling is unknown. METHODS Sixteen older adults participated in an intervention study with blue-enriched light delivered visually and/or transcranially for 12 min. Postural control in three conditions (60s eyes-open, dual-task, and eyes-closed), lower-limb motor coordination, and cognitive function were assessed. RESULTS Relative to placebo, visual blue-enriched light improved reaction time in the motor coordination task by 0.073 ± 0.035s (d = 0.77 ± 0.39; p = 0.003). Visual exposure decreased Area of Sway relative to the combined (d = 0.38 ± 0.26; p = 0.020) and placebo interventions (d = 0.47 ± 0.42; p = 0.067), with no significant effect on cognition. CONCLUSION Blue-enriched lighting demonstrates a novel approach to positively impact postural control and motor coordination in older adults. By impacting metrics associated with fall risk, light interventions may provide a clinical countermeasure to decrease the human costs of falls.
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Affiliation(s)
- C Martyn Beaven
- Te Huataki Waiora School of Health, University of Waikato, Tauranga, New Zealand.
| | - Liis Uiga
- Department of Sport and Exercise Sciences, Manchester Metropolitan University, Manchester, UK
| | - Kim Hébert-Losier
- Te Huataki Waiora School of Health, University of Waikato, Tauranga, New Zealand
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2
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Andrabi M, Upton BA, Lang RA, Vemaraju S. An Expanding Role for Nonvisual Opsins in Extraocular Light Sensing Physiology. Annu Rev Vis Sci 2023; 9:245-267. [PMID: 37196422 DOI: 10.1146/annurev-vision-100820-094018] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We live on a planet that is bathed in daily and seasonal sunlight cycles. In this context, terrestrial life forms have evolved mechanisms that directly harness light energy (plants) or decode light information for adaptive advantage. In animals, the main light sensors are a family of G protein-coupled receptors called opsins. Opsin function is best described for the visual sense. However, most animals also use opsins for extraocular light sensing for seasonal behavior and camouflage. While it has long been believed that mammals do not have an extraocular light sensing capacity, recent evidence suggests otherwise. Notably, encephalopsin (OPN3) and neuropsin (OPN5) are both known to mediate extraocular light sensing in mice. Examples of this mediation include photoentrainment of circadian clocks in skin (by OPN5) and acute light-dependent regulation of metabolic pathways (by OPN3 and OPN5). This review summarizes current findings in the expanding field of extraocular photoreception and their relevance for human physiology.
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Affiliation(s)
- Mutahar Andrabi
- The Visual Systems Group, Abrahamson Pediatric Eye Institute, Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA; ,
- Science of Light Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Brian A Upton
- The Visual Systems Group, Abrahamson Pediatric Eye Institute, Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA; ,
- Science of Light Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
- Molecular and Developmental Biology Graduate Program, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
- Medical Scientist Training Program, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
| | - Richard A Lang
- The Visual Systems Group, Abrahamson Pediatric Eye Institute, Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA; ,
- Science of Light Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
- Department of Ophthalmology, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
| | - Shruti Vemaraju
- The Visual Systems Group, Abrahamson Pediatric Eye Institute, Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA; ,
- Science of Light Center, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
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Zarkeshian P, Kergan T, Ghobadi R, Nicola W, Simon C. Photons guided by axons may enable backpropagation-based learning in the brain. Sci Rep 2022; 12:20720. [PMID: 36456619 PMCID: PMC9715721 DOI: 10.1038/s41598-022-24871-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 11/22/2022] [Indexed: 12/03/2022] Open
Abstract
Despite great advances in explaining synaptic plasticity and neuron function, a complete understanding of the brain's learning algorithms is still missing. Artificial neural networks provide a powerful learning paradigm through the backpropagation algorithm which modifies synaptic weights by using feedback connections. Backpropagation requires extensive communication of information back through the layers of a network. This has been argued to be biologically implausible and it is not clear whether backpropagation can be realized in the brain. Here we suggest that biophotons guided by axons provide a potential channel for backward transmission of information in the brain. Biophotons have been experimentally shown to be produced in the brain, yet their purpose is not understood. We propose that biophotons can propagate from each post-synaptic neuron to its pre-synaptic one to carry the required information backward. To reflect the stochastic character of biophoton emissions, our model includes the stochastic backward transmission of teaching signals. We demonstrate that a three-layered network of neurons can learn the MNIST handwritten digit classification task using our proposed backpropagation-like algorithm with stochastic photonic feedback. We model realistic restrictions and show that our system still learns the task for low rates of biophoton emission, information-limited (one bit per photon) backward transmission, and in the presence of noise photons. Our results suggest a new functionality for biophotons and provide an alternate mechanism for backward transmission in the brain.
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Affiliation(s)
- Parisa Zarkeshian
- grid.22072.350000 0004 1936 7697Department of Physics & Astronomy, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada ,grid.22072.350000 0004 1936 7697Institute for Quantum Science and Technology, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada ,grid.22072.350000 0004 1936 7697Hotchkiss Brain Institute, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1 Canada ,1QB Information Technologies (1QBit), Vancouver, BC Canada
| | - Taylor Kergan
- grid.22072.350000 0004 1936 7697Department of Physics & Astronomy, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada
| | - Roohollah Ghobadi
- grid.22072.350000 0004 1936 7697Department of Physics & Astronomy, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada ,grid.22072.350000 0004 1936 7697Institute for Quantum Science and Technology, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada ,grid.22072.350000 0004 1936 7697Hotchkiss Brain Institute, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1 Canada
| | - Wilten Nicola
- grid.22072.350000 0004 1936 7697Department of Physics & Astronomy, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada ,grid.22072.350000 0004 1936 7697Hotchkiss Brain Institute, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1 Canada ,grid.22072.350000 0004 1936 7697Department of Cell Biology and Anatomy, University of Calgary, Cumming School of Medicine, 3330 Hospital Drive NW, Calgary, AB Canada
| | - Christoph Simon
- grid.22072.350000 0004 1936 7697Department of Physics & Astronomy, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada ,grid.22072.350000 0004 1936 7697Institute for Quantum Science and Technology, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada ,grid.22072.350000 0004 1936 7697Hotchkiss Brain Institute, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1 Canada
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Bridge H, Morjaria R, Peirson SN, Coullon GSL, Warnaby CE, Pothecary CA, Leatherbarrow B, Foster RG, Downes SM. Functional Brain Imaging During Extra-Ocular Light Stimulation in Anophthalmic and Sighted Participants: No Evidence for Extra-Ocular Photosensitive Receptors. Front Neurosci 2021; 15:744543. [PMID: 34650401 PMCID: PMC8508779 DOI: 10.3389/fnins.2021.744543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 09/06/2021] [Indexed: 11/13/2022] Open
Abstract
Light plays a critical role in regulating physiology and behavior, including both visual and non-visual responses. In mammals, loss of both eyes abolishes all of these responses, demonstrating that the photoreceptors involved are exclusively ocular. By contrast, many non-mammalian species possess extra-ocular photoreceptors located in the pineal complex and deep brain. Whilst there have been suggestions of extra-ocular photoreception in mammals, including man, evidence for these photoreceptors is limited. One approach to objectively determine the presence of such receptors is to measure brain responses to light using functional magnetic resonance imaging (fMRI). Moreover, by using participants who are clinically anophthalmic (congenital and acquired), it is possible to investigate potential light detection in the absence of the retina. Here we scanned participants with anophthalmia and sighted participants in 4 different conditions; the first 3 conditions had a bright light source applied to the following locations: behind the right ear ("ear"), just below the nasal bridge and between the eyes ("head"), and at the right popliteal fossa ("knee"). In the fourth and final scan, the light source was switched off so that there was no light stimulus. All participants were scanned in a completely dark room. No consistent brain activity was detected during any of the light conditions in either sighted controls or anophthalmic participants. Thus, we do not provide any evidence for the presence of extraocular photoreceptors modulating human brain activity, despite recent evidence for gene transcription that may occur as a result of these photoreceptors.
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Affiliation(s)
- Holly Bridge
- Wellcome Centre for Integrative Neuroimaging, Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
| | - Rupal Morjaria
- Oxford Eye Hospital, John Radcliffe Hospital, Oxford, United Kingdom.,Sandwell & West Birmingham Hospitals NHS Trust, Birmingham, United Kingdom
| | - Stuart N Peirson
- Nuffield Laboratory of Ophthalmology, Sleep & Circadian Neuroscience Institute (SCNi), University of Oxford, Oxford, United Kingdom
| | - Gaelle S L Coullon
- Wellcome Centre for Integrative Neuroimaging, Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
| | - Catherine E Warnaby
- Wellcome Centre for Integrative Neuroimaging, Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
| | | | - Brian Leatherbarrow
- Central Manchester University Hospitals NHS Trust, Manchester, United Kingdom
| | - Russell G Foster
- Nuffield Laboratory of Ophthalmology, Sleep & Circadian Neuroscience Institute (SCNi), University of Oxford, Oxford, United Kingdom
| | - Susan M Downes
- Oxford Eye Hospital, John Radcliffe Hospital, Oxford, United Kingdom.,Nuffield Laboratory of Ophthalmology, Sleep & Circadian Neuroscience Institute (SCNi), University of Oxford, Oxford, United Kingdom
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Kinoshita T, Tanigawa T, Maruyama K, Morimoto K. The effects of bright light treatment via ear canals on quality of sleep and depressive mood among overworked employees: A randomized-controlled clinical trial. Work 2020; 67:323-329. [PMID: 33044213 DOI: 10.3233/wor-203282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Many overworked employees need tools to improve their depressive mood or sleep disorder. In Finland, a new device of bright light therapy was developed. OBJECTIVE Our objective was to evaluate the effect of bright light treatment via ear canals on improving the depressive mood and sleep disorder. METHODS We conducted a randomized, controlled, crossover designed, open-label trial. We examined 27 participants aged 23-52 years, assigned to either Early treatment or Later treatment groups. The Early treatment group used the device on weekdays for the first 4 weeks, followed by a 4-week observation period. The Later treatment group had an observation period for the first 4 weeks, followed by device treatment for the subsequent 4 weeks. Every Friday, the participants were asked to answer questionnaires: A Self-rating Depression Scale (SDS), an Athens Insomnia Scale (AIS), and a Profile of Mood States (POMS) Brief Form. RESULTS While no significant effect was found on the SDS following treatment (p = 0.16), the AIS showed a significant improvement (p = 0.004), and the scores for the Depression (D) and Vigor (V) of POMs decreased significantly (p = 0.045, p = 0.006, respectively). CONCLUSIONS Bright light treatment via ear canals may improve sleep quality and depressive mood.
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Affiliation(s)
- Tetsu Kinoshita
- Department of Basic Nursing and Health Science, Ehime University Graduate School of Medicine, Toon, Ehime, Japan
| | - Takeshi Tanigawa
- Department of Public Health, Juntendo University Graduate School of Medicine, Bunkyo-ku, Tokyo, Japan
| | - Koutatsu Maruyama
- Special Course of Food and Health Science, Department of Bioscience Graduate School of Agriculture, Ehime University, Matsuyama, Ehime, Japan
| | - Kanehisa Morimoto
- Human Factors Research Institute, Japan Foundation for Environmental Health Sciences, Minato-ku, Tokyo, Japan
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Williams B, Clarke R, Aspe R, Cole M, Hughes J. Managing Performance Throughout Periods of Travel. Strength Cond J 2017. [DOI: 10.1519/ssc.0000000000000317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Nissilä JS, Mänttäri SK, Särkioja TT, Tuominen HJ, Takala TE, Kiviniemi VJ, Sormunen RT, Saarela SYO, Timonen MJ. The distribution of melanopsin (OPN4) protein in the human brain. Chronobiol Int 2016; 34:37-44. [PMID: 27690288 DOI: 10.1080/07420528.2016.1232269] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Until now, melanopsin (OPN4) - a specialized photopigment being responsive especially to blue light wavelengths - has not been found in the human brain at protein level outside the retina. More specifically, OPN4 has only been found in about 2% of retinal ganglion cells (i.e. in intrinsically photosensitive retinal ganglion cells), and in a subtype of retinal cone-cells. Given that Allen Institute for Brain Science has described a wide distribution of OPN4 mRNA in two human brains, we aimed to investigate whether OPN4 is present in the human brain also at protein level. Western blotting and immunohistochemistry, as well as immunoelectron microscopy, were used to analyse the existence and distribution of OPN4 protein in 18 investigated areas of the human brain in samples obtained in forensic autopsies from 10 male subjects (54 ± 3.5 years). OPN4 protein expression was found in all subjects, and, furthermore, in 5 out of 10 subjects in all investigated brain areas localized in membranous compartments and cytoplasmic vesicles of neurons. To our opinion, the wide distribution of OPN4 in central areas of the human brain evokes a question whether ambient light has important straight targets in the human brain outside the retinohypothalamic tract (RHT). Further studies are, however, needed to investigate the putative physiological phototransductive actions of inborn OPN4 protein outside the RHT in the human brain.
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Affiliation(s)
- Juuso S Nissilä
- a University of Oulu, Center for Life Course Health Research , Oulu , Finland.,b Department of Biology, University of Oulu , Oulu , Finland
| | - Satu K Mänttäri
- b Department of Biology, University of Oulu , Oulu , Finland
| | - Terttu T Särkioja
- c University of Oulu , Institute of Diagnostics, Forensic Medicine , Oulu , Finland
| | - Hannu J Tuominen
- d University of Oulu , Institute of Diagnostics, Pathology , Oulu , Finland.,e Department of Pathology , Oulu University Hospital , Oulu , Finland
| | | | - Vesa J Kiviniemi
- g Department of Diagnostic Radiology , Oulu University Hospital , Oulu , Finland
| | - Raija T Sormunen
- d University of Oulu , Institute of Diagnostics, Pathology , Oulu , Finland.,e Department of Pathology , Oulu University Hospital , Oulu , Finland.,h Biocenter Oulu , University of Oulu , Oulu , Finland
| | | | - Markku J Timonen
- a University of Oulu, Center for Life Course Health Research , Oulu , Finland
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Pallesen S, Nødtvedt Ø, Saxvig IW, Bjorvatn B. A new light source (Valkee©) does not alter sleep–wake parameters and does not improve mood in phase delayed subjects. Sleep Biol Rhythms 2015. [DOI: 10.1007/s41105-015-0027-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Karbowski LM, Saroka KS, Murugan NJ, Persinger MA. LORETA indicates frequency-specific suppressions of current sources within the cerebrums of blindfolded subjects from patterns of blue light flashes applied over the skull. Epilepsy Behav 2015; 51:127-32. [PMID: 26276250 DOI: 10.1016/j.yebeh.2015.06.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 05/27/2015] [Accepted: 06/20/2015] [Indexed: 10/23/2022]
Abstract
An array of eight cloistered (completely covered) 470-nm LEDs was attached to the right caudal scalp of subjects while each sat blindfolded within a darkened chamber. The LEDs were activated by a computer-generated complex (frequency-modulated) temporal pattern that, when applied as weak magnetic fields, has elicited sensed presences and changes in LORETA (low-resolution electromagnetic tomography) configurations. Serial 5-min on to 5-min off presentations of the blue light (10,000lx) resulted in suppression of gamma activity within the right cuneus (including the extrastriate area), beta activity within the left angular and right superior temporal regions, and alpha power within the right parahippocampal region. The effect required about 5min to emerge followed by a transient asymptote for about 15 to 20min when diminished current source density was evident even during no light conditions. Subjective experiences, as measured by our standard exit questionnaire, reflected sensations similar to those reported when the pattern was presented as a weak magnetic field. Given previous evidence that photon flux density of this magnitude can penetrate the skull, these results suggest that properly configured LEDs that generate physiologically patterned light sequences might be employed as noninvasive methods to explore the dynamic characteristics of cerebral activity in epileptic and nonepileptic brains.
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Affiliation(s)
- Lukasz M Karbowski
- Behavioural Neuroscience Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada; Biomolecular Sciences Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
| | - Kevin S Saroka
- Behavioural Neuroscience Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada; Human Studies Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
| | - Nirosha J Murugan
- Behavioural Neuroscience Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada; Biomolecular Sciences Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
| | - Michael A Persinger
- Behavioural Neuroscience Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada; Human Studies Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada; Biomolecular Sciences Program, Laurentian University, Sudbury, Ontario P3E 2C6, Canada.
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10
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Flyktman A, Mänttäri S, Nissilä J, Timonen M, Saarela S. Transcranial light affects plasma monoamine levels and expression of brain encephalopsin in the mouse. ACTA ACUST UNITED AC 2015; 218:1521-6. [PMID: 25805701 DOI: 10.1242/jeb.111864] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 03/09/2015] [Indexed: 11/20/2022]
Abstract
Encephalopsin (OPN3) belongs to the light-sensitive transmembrane receptor family mainly expressed in the brain and retina. It is believed that light affects mammalian circadian rhythmicity only through the retinohypothalamic tract, which transmits light information to the suprachiasmatic nucleus in the hypothalamus. However, it has been shown that light penetrates the skull. Here, we present the effect of transcranial light treatment on OPN3 expression and monoamine concentrations in mouse brain and other tissues. Mice were randomly assigned to control group, morning-light group and evening-light group, and animals were illuminated transcranially five times a week for 8 min for a total of 4 weeks. The concentrations of OPN3 and monoamines were analysed using western blotting and HPLC, respectively. We report that transcranial light treatment affects OPN3 expression in different brain areas and plasma/adrenal gland monoamine concentrations. In addition, when light was administered at a different time of the day, the response varied in different tissues. These results provide new information on the effects of light on transmitters mediating mammalian rhythmicity.
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Affiliation(s)
- Antti Flyktman
- University of Oulu, Department of Biology, P.O. Box 3000, Oulu FIN-90014, Finland
| | - Satu Mänttäri
- Finnish Institute of Occupational Health, Aapistie 1, Oulu FI-90220, Finland
| | - Juuso Nissilä
- University of Oulu, Department of Biology, P.O. Box 3000, Oulu FIN-90014, Finland University of Oulu, Institute of Health Sciences, P.O. Box 5000, Oulu FIN-90014, Finland
| | - Markku Timonen
- University of Oulu, Institute of Health Sciences, P.O. Box 5000, Oulu FIN-90014, Finland
| | - Seppo Saarela
- University of Oulu, Department of Biology, P.O. Box 3000, Oulu FIN-90014, Finland
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Borchardt V, Krause AL, Starck T, Nissilä J, Timonen M, Kiviniemi V, Walter M. Graph theory reveals hyper-functionality in visual cortices of Seasonal Affective Disorder patients. World J Biol Psychiatry 2015; 16:123-34. [PMID: 25363311 DOI: 10.3109/15622975.2014.966144] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES Seasonal affective disorder (SAD) is a subtype of recurrent unipolar or bipolar depressive disorder with a higher prevalence in winter than in summer. The biological underpinnings of SAD are so far poorly understood. Studies examining SAD have found disturbances between the molecular and connectivity scales. The aim of the study was to explore changes in functional connectivity typical for SAD. METHODS We investigated unmedicated, untreated SAD patients and healthy controls using resting-state functional magnetic resonance imaging (rs-fMRI) utilizing graph theory, a data driven and hypothesis free approach, to model functional networks of the brain. RESULTS Comparing whole brain network properties using graph theory we observed globally affected network topologies with increasing pathlength in SAD. Nodal changes, however, were highly restricted to bilateral inferior occipital cortex. Interestingly, we found a lateralization where hyper-connectedness was restricted to right inferior occipital cortex and hyper-efficiency was found in the left inferior occipital cortex. Furthermore, we found these nodes became more "hub like" in patients, suggesting a greater functional role. CONCLUSIONS Our work stresses the importance of abnormal intrinsic processing during rest, primarily affecting visual areas and subsequently changing whole brain networks, and thus providing an important hint towards potential future therapeutic approaches.
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Jurvelin H, Takala T, Nissilä J, Timonen M, Rüger M, Jokelainen J, Räsänen P. Transcranial bright light treatment via the ear canals in seasonal affective disorder: a randomized, double-blind dose-response study. BMC Psychiatry 2014; 14:288. [PMID: 25330838 PMCID: PMC4207317 DOI: 10.1186/s12888-014-0288-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 10/03/2014] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Bright light treatment is effective for seasonal affective disorder (SAD), although the mechanisms of action are still unknown. We investigated whether transcranial bright light via the ear canals has an antidepressant effect in the treatment of SAD. METHODS During the four-week study period, 89 patients (67 females; 22 males, aged 22-65, mean ± SD age: 43.2 ± 10.9 years) suffering from SAD were randomized to receive a 12-min daily dose of photic energy of one of three intensities (1 lumen/0.72 mW/cm(2); 4 lumens/2.881 mW/cm(2); 9 lumens/6.482 mW/cm(2)) via the ear canals. The light was produced using light-emitting diodes. The severity of depressive symptoms was assessed with the Hamilton Depression Rating Scale - Seasonal Affective Disorder (SIGH-SAD), the Hamilton Anxiety Rating Scale (HAMA), and the Beck Depression Inventory (BDI). Cognitive performance was measured by the Trail Making Test (TMT). The within-group and between-group changes in these variables throughout the study were analysed with a repeated measures analysis of variance (ANOVA), whereas gender differences at baseline within the light groups were analysed using Student's t-tests. RESULTS Patients in all three groups showed significant decreases in their BDI, HAMA, and SIGH-SAD scores. Response rates, i.e., an at least 50% decrease of symptoms as measured by the BDI, were 74%-79% in the three treatment groups. Corresponding variations for the SIGH-SAD and the HAMA were 35-45% and 47-62%, respectively. No intensity-based dose-response relationships in the improvement of anxiety and depressive symptoms or cognitive performance between treatment groups were observed. Approximately one in four patients experienced mild adverse effects, of which the most common were headache, insomnia, and nausea. CONCLUSIONS These results suggests that transcranial bright light treatment may have antidepressant and anxiolytic effect in SAD patients, as both self- and psychiatrist-rated depressive and anxiety symptoms decreased in all treatment groups. These improvements are comparable to findings of earlier bright light studies that used conventional devices. The lack of dose response may be due to a saturation effect above a certain light intensity threshold. Further studies on the effects of transcranial bright light with an adequate placebo condition are needed. TRIAL REGISTRATION NCT01293409, ClinicalTrials.gov.
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Affiliation(s)
- Heidi Jurvelin
- />Department of Psychiatry, University of Oulu, Institute of Clinical Medicine, Box 5000, 90014 Oulu, Finland
- />University of Oulu, Institute of Health Sciences, Box 5000, 90014 Oulu, Finland
- />Valkee Oy, Elektroniikkatie 4, 90590 Oulu, Finland
| | - Timo Takala
- />Oulu Deaconess Institute, Box 365, 90101 Oulu, Finland
| | - Juuso Nissilä
- />University of Oulu, Institute of Health Sciences, Box 5000, 90014 Oulu, Finland
- />Valkee Oy, Elektroniikkatie 4, 90590 Oulu, Finland
| | - Markku Timonen
- />University of Oulu, Institute of Health Sciences, Box 5000, 90014 Oulu, Finland
- />Oulu Health Center, Box 8, 90015 Oulu, Finland
| | - Melanie Rüger
- />Valkee Oy, Elektroniikkatie 4, 90590 Oulu, Finland
| | - Jari Jokelainen
- />University of Oulu, Institute of Health Sciences, Box 5000, 90014 Oulu, Finland
- />Unit of General Practice, Oulu University Hospital, 90029 Oulu, Finland
| | - Pirkko Räsänen
- />Department of Psychiatry, University of Oulu, Institute of Clinical Medicine, Box 5000, 90014 Oulu, Finland
- />Department of Psychiatry, Oulu University Hospital, Box 26, 90026 Oulu, Finland
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Jurvelin H, Takala T, Heberg L, Nissilä J, Rüger M, Leppäluoto J, Saarela S, Vakkuri O. Transcranial bright light exposure via ear canals does not suppress nocturnal melatonin in healthy adults – A single-blind, sham-controlled, crossover trial. Chronobiol Int 2014; 31:855-60. [DOI: 10.3109/07420528.2014.916297] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Tulppo MP, Jurvelin H, Roivainen E, Nissilä J, Hautala AJ, Kiviniemi AM, Kiviniemi VJ, Takala T. Effects of bright light treatment on psychomotor speed in athletes. Front Physiol 2014; 5:184. [PMID: 24860513 PMCID: PMC4026757 DOI: 10.3389/fphys.2014.00184] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 04/23/2014] [Indexed: 11/13/2022] Open
Abstract
Purpose: A recent study suggests that transcranial brain targeted light treatment via ear canals may have physiological effects on brain function studied by functional magnetic resonance imaging (fMRI) techniques in humans. We tested the hypothesis that bright light treatment could improve psychomotor speed in professional ice hockey players. Methods: Psychomotor speed tests with audio and visual warning signals were administered to a Finnish National Ice Hockey League team before and after 24 days of transcranial bright light or sham treatment. The treatments were given during seasonal darkness in the Oulu region (latitude 65 degrees north) when the strain on the players was also very high (10 matches during 24 days). A daily 12-min dose of bright light or sham (n = 11 for both) treatment was given every morning between 8 and 12 am at home with a transcranial bright light device. Mean reaction time and motor time were analyzed separately for both psychomotor tests. Analysis of variance for repeated measures adjusted for age was performed. Results: Time × group interaction for motor time with a visual warning signal was p = 0.024 after adjustment for age. In Bonferroni post-hoc analysis, motor time with a visual warning signal decreased in the bright light treatment group from 127 ± 43 to 94 ± 26 ms (p = 0.024) but did not change significantly in the sham group 121 ± 23 vs. 110 ± 32 ms (p = 0.308). Reaction time with a visual signal did not change in either group. Reaction or motor time with an audio warning signal did not change in either the treatment or sham group. Conclusion: Psychomotor speed, particularly motor time with a visual warning signal, improves after transcranial bright light treatment in professional ice-hockey players during the competition season in the dark time of the year.
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Affiliation(s)
- Mikko P Tulppo
- Department of Exercise and Medical Physiology Verve, Oulu, Finland
| | - Heidi Jurvelin
- Department of General Practice, Institute of Health Sciences, University of Oulu Oulu, Finland
| | - Eka Roivainen
- Department of Exercise and Medical Physiology Verve, Oulu, Finland
| | - Juuso Nissilä
- Department of Biology, University of Oulu Oulu, Finland
| | - Arto J Hautala
- Department of Exercise and Medical Physiology Verve, Oulu, Finland
| | | | - Vesa J Kiviniemi
- Department of Diagnostic Radiology, University of Oulu Oulu, Finland
| | - Timo Takala
- Department of Sports and Exercise Medicine, Oulu Deaconess Institute Oulu, Finland
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Bromundt V, Frey S, Odermatt J, Cajochen C. Extraocular light via the ear canal does not acutely affect human circadian physiology, alertness and psychomotor vigilance performance. Chronobiol Int 2013; 31:343-8. [PMID: 24224577 DOI: 10.3109/07420528.2013.854250] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We aimed at testing potential effects of extraocular bright light via the ear canals on human evening melatonin levels, sleepiness and psychomotor vigilance performance. Twenty healthy young men and women (10/10) kept a regular sleep-wake cycle during the 2-week study. The volunteers reported to the laboratory on three evenings, 2 h 15 min before usual bedtime, on average at 21:45 h. They were exposed to three different light conditions, each lasting for 12 min: extraocular bright light via the ear canal, ocular bright light as an active control condition and a control condition (extraocular light therapy device with completely blacked out LEDs). The timing of exposure was on average from 22:48 to 23:00 h. During the 2-h protocol, saliva samples were collected in 15-min intervals for melatonin assays along with subjective sleepiness ratings, and the volunteers performed a 10-min visual psychomotor vigilance task (PVT) prior to and after each light condition. The evening melatonin rise was significantly attenuated after the 12-min ocular bright light exposure while no significant changes were observed after the extraocular bright light and sham light condition. Subjective sleepiness decreased immediately over a short period only after ocular light exposure. No significant differences were observed for mean reaction times and the number of lapses for the PVT between the three light conditions. We conclude that extraocular transcranial light exposure in the late evening does not suppress melatonin, reduce subjective sleepiness or improve performance, and therefore, does not acutely influence the human circadian timing system.
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Affiliation(s)
- Vivien Bromundt
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel , Basel , Switzerland
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Persinger MA, Dotta BT, Saroka KS. Bright light transmits through the brain: Measurement of photon emissions and frequency-dependent modulation of spectral electroencephalographic power. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/wjns.2013.31002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Maksimovich IV. Transcatheter treatment of atherosclerotic lesions of the brain complicated by vascular dementia development. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/wjns.2012.24031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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