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Lefebvre S, Very E, Jardri R, Horn M, Yrondi A, Delmaire C, Rascle C, Dujardin K, Thomas P, Pins D. The neural correlates of the visual consciousness in schizophrenia: an fMRI study. Eur Arch Psychiatry Clin Neurosci 2021; 271:661-675. [PMID: 32813032 PMCID: PMC8119280 DOI: 10.1007/s00406-020-01167-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 07/08/2020] [Indexed: 12/12/2022]
Abstract
In the current literature, two distinct and opposite models are suggested to explain the consciousness disorders in schizophrenia. The first one suggests that consciousness disorders rely on a low-level processing deficit, when the second model suggests that consciousness disorders rely on disruption in the ability to consciously access information, with preserved unconscious processing. The current study aims to understand the mechanisms associated with visual consciousness disorder in order to pave the road that will settle the debate regarding these hypotheses. During a functional magnetic resonance imaging session, 19 healthy participants (HC) and 15 patients with schizophrenia (SCZ) performed a visual detection task to compare the neural substrates associated with the conscious access to the visual inputs. The visual detection threshold was significantly higher in SCZ than in HC [t(32) = 3.37, p = 0.002]. Whole-brain ANOVA demonstrated that around the visual detection threshold patients with SCZ failed to activate a large network of brain areas compared to HC. (1) During conscious vision, HC engaged more the left cuneus and the right occipital cortex than patients with SCZ, (2) during unconscious vision, HC engaged a large network that patients with SCZ failed to activate, and finally, (3) during the access to consciousness process, patients with SCZ failed to activate the anterior cingulate cortex. These results suggest that the consciousness disorders in schizophrenia rely on specific dysfunctions depending on the consciousness stage. The disorders of the conscious vision are associated with dysfunction of occipital areas while the ones associated with unconscious vision rely on a large widespread network. Finally, the conscious access to the visual inputs is impaired by a dysfunction of the anterior cingulate cortex. The current study suggests that none of the two suggested models can explain consciousness disorders in schizophrenia. We suggest that there is an alternative model supporting that the conscious access to visual inputs is due to a disengagement of the supragenual anterior cingulate during the unconscious processing of the visual inputs associated with a sensory deficit.
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Affiliation(s)
- S. Lefebvre
- University of Lille, Inserm U1172, Centre Lille Neuroscience and Cognition, CHU Lille, 59000 Lille, France ,Plateforme CURE, CHU Lille, Hôpital Fontan, 59000 Lille, France ,Translational Research Center, University Hospital of Psychiatry, University of Bern, Bern, Switzerland
| | - E. Very
- ToNIC, Toulouse NeuroImaging Center, Université de Toulouse, INSERM UMR 1214, CHU PURPAN – Pavillon BAUDOT, Place du Dr Joseph Baylac, 31024 Toulouse, France
| | - R. Jardri
- University of Lille, Inserm U1172, Centre Lille Neuroscience and Cognition, CHU Lille, 59000 Lille, France ,Plateforme CURE, CHU Lille, Hôpital Fontan, 59000 Lille, France
| | - M. Horn
- University of Lille, Inserm U1172, Centre Lille Neuroscience and Cognition, CHU Lille, 59000 Lille, France ,Plateforme CURE, CHU Lille, Hôpital Fontan, 59000 Lille, France
| | - A. Yrondi
- ToNIC, Toulouse NeuroImaging Center, Université de Toulouse, INSERM UMR 1214, CHU PURPAN – Pavillon BAUDOT, Place du Dr Joseph Baylac, 31024 Toulouse, France
| | - C. Delmaire
- University of Lille, Inserm U1172, Centre Lille Neuroscience and Cognition, CHU Lille, 59000 Lille, France ,Neuroimaging Department, Lille University Medical Center, 59000 Lille, France
| | - C. Rascle
- Plateforme CURE, CHU Lille, Hôpital Fontan, 59000 Lille, France
| | - K. Dujardin
- University of Lille, Inserm U1172, Centre Lille Neuroscience and Cognition, CHU Lille, 59000 Lille, France ,Department of Neurology and Movement Disorders, Lille University Medical Center, 59000 Lille, France
| | - P. Thomas
- University of Lille, Inserm U1172, Centre Lille Neuroscience and Cognition, CHU Lille, 59000 Lille, France ,Plateforme CURE, CHU Lille, Hôpital Fontan, 59000 Lille, France
| | - D. Pins
- University of Lille, Inserm U1172, Centre Lille Neuroscience and Cognition, CHU Lille, 59000 Lille, France ,Plateforme CURE, CHU Lille, Hôpital Fontan, 59000 Lille, France
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Naghavi HR, Nyberg L. Common fronto-parietal activity in attention, memory, and consciousness: shared demands on integration? Conscious Cogn 2004; 14:390-425. [PMID: 15950889 DOI: 10.1016/j.concog.2004.10.003] [Citation(s) in RCA: 270] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2004] [Revised: 10/10/2004] [Accepted: 10/17/2004] [Indexed: 11/19/2022]
Abstract
Fronto-parietal activity has been frequently observed in fMRI and PET studies of attention, working memory, and episodic memory retrieval. Several recent fMRI studies have also reported fronto-parietal activity during conscious visual perception. A major goal of this review was to assess the degree of anatomical overlap among activation patterns associated with these four functions. A second goal was to shed light on the possible cognitive relationship of processes that relate to common brain activity across functions. For all reviewed functions we observed a consistent and overlapping pattern of brain activity. The overlap was most pronounced for the bilateral parietal cortex (BA 7 and BA 40; close to the intraparietal sulcus), and dorsolateral prefrontal cortex (right BA 9 and left BA 6). The common fronto-parietal activity will be discussed in terms of processes related to integration of distributed representations in the brain.
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Affiliation(s)
- Hamid Reza Naghavi
- Psychiatry and Clinical Psychology Research Center, Tehran University of Medical Sciences, Roozbeh Hospital, South Kargar Street, 13185/1741 Tehran, Iran.
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