Faculty Member At New York University Medical School
Kandel took a position in the Departments of Physiology and Psychiatry at the New York University Medical School, eventually forming the Division of Neurobiology and Behavior. Working with Irving Kupferman and Harold Pinsker it was possible to develop protocols for demonstrating simple forms of learning by intact Aplysia. In particular, the now famous gill-withdrawal reflex, by which the tender Aplysia gill tissue is withdrawn from danger, was shown to be sensitive to both habituation and sensitization. By 1971 Tom Carew joined the research group and helped extend the work from studies restricted to short-term memory to additional experiments that included additional physiological processes required for long-term memory.
By 1981, laboratory members including Terry Walters, Tom Abrams, and Robert Hawkins had been able to extend the Aplysia system into the study of classical conditioning, a finding which helped close the apparent gap between the simple forms of learning often associated with invertebrates and more complex types of learning more often recognized in vertebrates. Along with the fundamental behavioral studies, other work in the lab traced the neuronal circuits of sensory neurons, interneurons, and motor neurons involved in the learned behaviors. This allowed analysis of the specific synaptic connections that are modified by learning in the intact animals. The results from Kandel's laboratory provided solid evidence for the mechanistic basis of learning as "a change in the functional effectiveness of previously existing excitatory connections."
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