Associate Professor |
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My colleagues and I study an isolated piece of the nervous system, but an isolated piece that can perform a "behavior." In particular, we study the isolated spinal cord of a primitive vertebrate, the lamprey. For these studies, we use whole animals and semi-reduced preparations. In this way, we are able to bridge the gap between the parts of the system and the whole animal's behavior. The work is focused on the mechanisms underlying the generation of an organized motor behavior, locomotion.
In addition to the normal animal, we also study the process of regeneration in the lamprey spinal cord. The animal spontaneously regenerates after injury, but the regeneration can be either functional or dysfunctional. We study how the spinal cord is organized under the two sets of conditions in hopes of preventing problematic regeneration in people when regeneration is finally achieved in human spinal cord injury patients.
We use neurophysiology, immunohistochemistry, computational and neuromorphic engineering to disentangle the various threads of the system. People using the diverse experimental methods all interact and inform each other. Thus, we hope to understand a complex behavior in a relatively simple animal, and apply the understanding to a much more complex animal - the human.
Representative Publications:
Mellen, N., Kiemel, T., Cohen, A.H. 1995. Correlational analysis of fictive swimming in the lamprey reveals strong functional intersegmental coupling. "J. Neurophysiol." 73: 1020-1030.
Kiemel, T. and Cohen, A.H. 1998 Estimation of Coupling Strength in Regenerated Lamprey Spinal Cords Based on a Stochastic Phase Model. "J. Computat. Neurosci." 5: 267-284.
Cohen, A.H., Guan,L., Pate,V., and Kiemel, T. 1999. Temperature can alter the functional outcome of spinal cord regeneration in larval lampreys. "Neuroscience," 90:957-965.
Cymbalyuk, G. S., Patel, R. L. Calabrese, G.N, DeWeerth, S. P., Cohen, A.H. 2000. Modeling Alternation to Synchrony with Inhibitory Coupling: A neuromorphic VLSI Approach. "Neural Comput.," 12:XX (in press).
Guan, L. Kiemel, T., and Cohen, A.H. Impact of movement and movement related feedback on the central pattern generator for locomotion in the lamprey. (Submitted).
Cohen, A. H., and D.L. Boothe (submitted) "Sensorimotor interactions: Principles derived from central pattern generators." To appear in The Handbook of Brain Theory and Neural Networks, Second edition, (M.A. Arbib, Ed.), Cambridge, MA: The MIT Press, 2002. http://mitpress.mit.edu © The MIT Press
Lewis, M. A., Etienne-Cummings, R., Cohen, A.H., and Hartmann, M., "Toward Biomorphic Control using Custom aVLSI Chips", Proceedings of the 2000 International Conference on Robotics and Automation, San Francisco, April, 2000.
A.H. Cohen,"Growing Up Female", an Autobiography published in the "Neuroethology Newsletter."
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