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Gray H, Thiele A, Rowe C. Using preferred fluids and different reward schedules to motivate rhesus macaques ( Macaca mulatta) in cognitive tasks. Lab Anim 2018; 53:372-382. [PMID: 30282500 DOI: 10.1177/0023677218801390] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Rhesus macaques (Macaca mulatta) used in behavioural neuroscience are often required to complete cognitively complex tasks, for which a high level of motivation is essential. To induce motivation, researchers may implement fluid-restriction protocols, whereby freely available water is limited, such that fluid can be used as a reward in the laboratory. A variety of different rewards and schedules are used, but there exists a lack of data assessing their effectiveness. In this study, we aimed to quantify fluid preference in rhesus macaques and to use these preferences to compare the motivational quality of different reward schedules: the monkey's previous reward (i.e. the fluid used to reward them in past studies), their new preferred reward, a variable schedule of previous and preferred reward, and a choice between the previous and preferred rewards. We found that it may be possible to reduce the level of restriction if an adequately motivating preferred reward is identified, but that this is dependent on the animal. Each monkey responded differently to both the fluid-preference assessments and to the different reward schedules. As such, monkeys should not be subject to 'blanket' protocols but should be assessed individually to maintain adequate scientific data collection at the least severe level of fluid restriction.
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Affiliation(s)
- Helen Gray
- 1 School of Biology, University of Leeds, UK
| | | | - Candy Rowe
- 2 Institute of Neuroscience, Newcastle University, UK
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2
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Libey T, Fetz EE. Open-Source, Low Cost, Free-Behavior Monitoring, and Reward System for Neuroscience Research in Non-human Primates. Front Neurosci 2017; 11:265. [PMID: 28559792 PMCID: PMC5432619 DOI: 10.3389/fnins.2017.00265] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 04/24/2017] [Indexed: 11/16/2022] Open
Abstract
We describe a low-cost system designed to document bodily movement and neural activity and deliver rewards to monkeys behaving freely in their home cage. An important application is to studying brain-machine interface (BMI) systems during free behavior, since brain signals associated with natural movement can differ significantly from those associated with more commonly used constrained conditions. Our approach allows for short-latency (<500 ms) reward delivery and behavior monitoring using low-cost off-the-shelf components. This system interfaces existing untethered recording equipment with a custom hub that controls a cage-mounted feeder. The behavior monitoring system uses a depth camera to provide real-time, easy-to-analyze, gross movement data streams. In a proof-of-concept experiment we demonstrate robust learning of neural activity using the system over 14 behavioral sessions.
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Affiliation(s)
- Tyler Libey
- Department of Bioengineering, University of WashingtonSeattle, WA, United States
| | - Eberhard E Fetz
- Department of Bioengineering, University of WashingtonSeattle, WA, United States.,Department of Physiology and Biophysics, University of WashingtonSeattle, WA, United States.,National Science Foundation ERC Center for Sensorimotor Neural EngineeringSeattle, WA, United States
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Trautmann E, O'Shea DJ, Shrestha S, Lin S, Ryu S, Shenoy K. Design of an implantable artificial dural window for chronic two-photon optical imaging in non-human primates. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2015:7554-7. [PMID: 26738040 DOI: 10.1109/embc.2015.7320140] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Optical functional imaging methods such as calcium imaging have become a powerful tool for investigating neural activity in-vivo. Here, we present a design for a titanium implantable chamber with transparent silicone artificial dura which enables two-photon calcium imaging in non-human primates. This chamber accommodates imaging with high numerical aperture multiphoton objective lenses, and remains sealed, protecting the brain from the surrounding environment. In addition, we describe a tunable tissue stabilization system to apply gentle mechanical pressure to stabilize tissue during imaging. Our results suggest that two-photon calcium imaging may soon facilitate a new class of circuit and systems neuroscience experiments in non-human primates.
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Pereira EFR, Aracava Y, DeTolla LJ, Beecham EJ, Basinger GW, Wakayama EJ, Albuquerque EX. Animal models that best reproduce the clinical manifestations of human intoxication with organophosphorus compounds. J Pharmacol Exp Ther 2014; 350:313-21. [PMID: 24907067 PMCID: PMC4109493 DOI: 10.1124/jpet.114.214932] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Accepted: 06/05/2014] [Indexed: 01/14/2023] Open
Abstract
The translational capacity of data generated in preclinical toxicological studies is contingent upon several factors, including the appropriateness of the animal model. The primary objectives of this article are: 1) to analyze the natural history of acute and delayed signs and symptoms that develop following an acute exposure of humans to organophosphorus (OP) compounds, with an emphasis on nerve agents; 2) to identify animal models of the clinical manifestations of human exposure to OPs; and 3) to review the mechanisms that contribute to the immediate and delayed OP neurotoxicity. As discussed in this study, clinical manifestations of an acute exposure of humans to OP compounds can be faithfully reproduced in rodents and nonhuman primates. These manifestations include an acute cholinergic crisis in addition to signs of neurotoxicity that develop long after the OP exposure, particularly chronic neurologic deficits consisting of anxiety-related behavior and cognitive deficits, structural brain damage, and increased slow electroencephalographic frequencies. Because guinea pigs and nonhuman primates, like humans, have low levels of circulating carboxylesterases-the enzymes that metabolize and inactivate OP compounds-they stand out as appropriate animal models for studies of OP intoxication. These are critical points for the development of safe and effective therapeutic interventions against OP poisoning because approval of such therapies by the Food and Drug Administration is likely to rely on the Animal Efficacy Rule, which allows exclusive use of animal data as evidence of the effectiveness of a drug against pathologic conditions that cannot be ethically or feasibly tested in humans.
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Affiliation(s)
- Edna F R Pereira
- Division of Translational Toxicology, Department of Epidemiology and Public Health (E.F.R.P., Y.A., E.X.A.), and Program of Comparative Medicine and Departments of Pathology, Medicine, and Epidemiology and Public Health (L.J.D.), University of Maryland School of Medicine, Baltimore, Maryland; Countervail Corporation, Charlotte, North Carolina (E.J.B., G.W.B.); and Biomedical Advanced Research and Development Authority and Office of the Assistant Secretary for Preparedness and Response, Department of Health and Human Services, Washington, DC (E.J.W.)
| | - Yasco Aracava
- Division of Translational Toxicology, Department of Epidemiology and Public Health (E.F.R.P., Y.A., E.X.A.), and Program of Comparative Medicine and Departments of Pathology, Medicine, and Epidemiology and Public Health (L.J.D.), University of Maryland School of Medicine, Baltimore, Maryland; Countervail Corporation, Charlotte, North Carolina (E.J.B., G.W.B.); and Biomedical Advanced Research and Development Authority and Office of the Assistant Secretary for Preparedness and Response, Department of Health and Human Services, Washington, DC (E.J.W.)
| | - Louis J DeTolla
- Division of Translational Toxicology, Department of Epidemiology and Public Health (E.F.R.P., Y.A., E.X.A.), and Program of Comparative Medicine and Departments of Pathology, Medicine, and Epidemiology and Public Health (L.J.D.), University of Maryland School of Medicine, Baltimore, Maryland; Countervail Corporation, Charlotte, North Carolina (E.J.B., G.W.B.); and Biomedical Advanced Research and Development Authority and Office of the Assistant Secretary for Preparedness and Response, Department of Health and Human Services, Washington, DC (E.J.W.)
| | - E Jeffrey Beecham
- Division of Translational Toxicology, Department of Epidemiology and Public Health (E.F.R.P., Y.A., E.X.A.), and Program of Comparative Medicine and Departments of Pathology, Medicine, and Epidemiology and Public Health (L.J.D.), University of Maryland School of Medicine, Baltimore, Maryland; Countervail Corporation, Charlotte, North Carolina (E.J.B., G.W.B.); and Biomedical Advanced Research and Development Authority and Office of the Assistant Secretary for Preparedness and Response, Department of Health and Human Services, Washington, DC (E.J.W.)
| | - G William Basinger
- Division of Translational Toxicology, Department of Epidemiology and Public Health (E.F.R.P., Y.A., E.X.A.), and Program of Comparative Medicine and Departments of Pathology, Medicine, and Epidemiology and Public Health (L.J.D.), University of Maryland School of Medicine, Baltimore, Maryland; Countervail Corporation, Charlotte, North Carolina (E.J.B., G.W.B.); and Biomedical Advanced Research and Development Authority and Office of the Assistant Secretary for Preparedness and Response, Department of Health and Human Services, Washington, DC (E.J.W.)
| | - Edgar J Wakayama
- Division of Translational Toxicology, Department of Epidemiology and Public Health (E.F.R.P., Y.A., E.X.A.), and Program of Comparative Medicine and Departments of Pathology, Medicine, and Epidemiology and Public Health (L.J.D.), University of Maryland School of Medicine, Baltimore, Maryland; Countervail Corporation, Charlotte, North Carolina (E.J.B., G.W.B.); and Biomedical Advanced Research and Development Authority and Office of the Assistant Secretary for Preparedness and Response, Department of Health and Human Services, Washington, DC (E.J.W.)
| | - Edson X Albuquerque
- Division of Translational Toxicology, Department of Epidemiology and Public Health (E.F.R.P., Y.A., E.X.A.), and Program of Comparative Medicine and Departments of Pathology, Medicine, and Epidemiology and Public Health (L.J.D.), University of Maryland School of Medicine, Baltimore, Maryland; Countervail Corporation, Charlotte, North Carolina (E.J.B., G.W.B.); and Biomedical Advanced Research and Development Authority and Office of the Assistant Secretary for Preparedness and Response, Department of Health and Human Services, Washington, DC (E.J.W.)
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Foster JD, Nuyujukian P, Freifeld O, Gao H, Walker R, I Ryu S, H Meng T, Murmann B, J Black M, Shenoy KV. A freely-moving monkey treadmill model. J Neural Eng 2014; 11:046020. [PMID: 24995476 DOI: 10.1088/1741-2560/11/4/046020] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE Motor neuroscience and brain-machine interface (BMI) design is based on examining how the brain controls voluntary movement, typically by recording neural activity and behavior from animal models. Recording technologies used with these animal models have traditionally limited the range of behaviors that can be studied, and thus the generality of science and engineering research. We aim to design a freely-moving animal model using neural and behavioral recording technologies that do not constrain movement. APPROACH We have established a freely-moving rhesus monkey model employing technology that transmits neural activity from an intracortical array using a head-mounted device and records behavior through computer vision using markerless motion capture. We demonstrate the flexibility and utility of this new monkey model, including the first recordings from motor cortex while rhesus monkeys walk quadrupedally on a treadmill. MAIN RESULTS Using this monkey model, we show that multi-unit threshold-crossing neural activity encodes the phase of walking and that the average firing rate of the threshold crossings covaries with the speed of individual steps. On a population level, we find that neural state-space trajectories of walking at different speeds have similar rotational dynamics in some dimensions that evolve at the step rate of walking, yet robustly separate by speed in other state-space dimensions. SIGNIFICANCE Freely-moving animal models may allow neuroscientists to examine a wider range of behaviors and can provide a flexible experimental paradigm for examining the neural mechanisms that underlie movement generation across behaviors and environments. For BMIs, freely-moving animal models have the potential to aid prosthetic design by examining how neural encoding changes with posture, environment and other real-world context changes. Understanding this new realm of behavior in more naturalistic settings is essential for overall progress of basic motor neuroscience and for the successful translation of BMIs to people with paralysis.
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Affiliation(s)
- Justin D Foster
- Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA
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