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Journal of Neuroscience, Vol 3, 2350-2364, Copyright © 1983 by Society for Neuroscience
The parcellation of the medial geniculate body of the cat defined by the auditory response properties of single units
MB Calford
Single unit responses were recorded in the medial geniculate body (MGB) of
anesthetized cats. In response to acoustical stimulation the properties of
response latency, discharge pattern, frequency tuning, binaural
interaction, and habituation were examined to allow an appraisal of the
differentiation of the MGB by electrophysiological means. It is found that
definite boundaries can be determined at which there is a distinct change
in response properties; the position of these "physiological boundaries"
seems to correspond with the boundaries between the seven subnuclei of the
MGB described by Morest (Morest, D. K. (1964) J. Anat. 98: 611-630) in
Golgi-stained material. Using these physiological boundaries to determine
unit locations, population comparisons are made allowing the description of
each subnucleus in terms of its auditory response properties. It is
suggested that these properties, together with the limited information
gained from Nissl cytoarchitecture, are sufficient to describe the location
of physiological recording sites in the MGB.
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