Conditioning pp 697-710 | Cite as

Sensory Plasticity and Learning: The Magnocellular Medial Geniculate Nucleus of the Auditory System

  • Norman M. Weinberger
Part of the Advances in Behavioral Biology book series (ABBI, volume 26)

Summary

The magnocellular medial genículate nucleus (MGm) is a nonlemniscal component of the thalamo-cortical auditory system. It develops discharge plasticity rapidly during behavioral conditioning, in contrast to the ventral medial geniculate, the lemniscal and non-plastic component. Continual recordings from single cells during the acquisition of the pupillary conditioned response reveals an exceptionally high proportion of plastic neurons, the most plastic of which have a pronounced onset discharge to initial presentation of acoustic stimuli. Facilitation of monosynaptic field potentials in MGm lasts for several hours following brief high-frequency stimulation of its major afferent, with respect both to increased amplitude and decreased latency. Responses of single units are also facilitated for hours, as indexed by increased probability of discharges and decreased latency and latency variability. Together, these findings suggest a functional relationship between conditioning and long-lasting facilitation. Moreover, they underscore the capacity of the auditory system to express physiological plasticity under a variety of circumstances.

Keywords

Conditioned Stimulus Auditory System Inferior Colliculus Tree Shrew High Frequency Stimulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1982

Authors and Affiliations

  • Norman M. Weinberger
    • 1
  1. 1.Department of PsychobiologyUniversity of CaliforniaIrvineUSA

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