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The Journal of Neurophysiology Vol. 84 No. 1 July 2000, pp. 325-333
Copyright ©2000 by the American Physiological Society
Department of Biology, Washington University, St. Louis, Missouri 63130
Zhang, Yunfeng and
Nobuo Suga.
Modulation of Responses and Frequency Tuning of Thalamic and
Collicular Neurons by Cortical Activation in Mustached Bats. J. Neurophysiol. 84: 325-333, 2000. In the
Jamaican mustached bat, Pteronotus parnellii parnellii,
one of the subdivisions of the primary auditory cortex is
disproportionately large and over-represents sound at ~61 kHz. This
area, called the Doppler-shifted constant frequency (DSCF) processing
area, consists of neurons extremely sharply tuned to a sound at ~61 kHz. We found that a focal activation of the DSCF area evokes highly
specific corticofugal modulation in the inferior colliculus and medial
geniculate body. Namely a focal activation of cortical DSCF neurons
tuned to, say, 61.2 kHz with 0.2-ms-long, 100-nA electric pulses
drastically increases the excitatory responses of thalamic and
collicular neurons tuned to 61.2 kHz without shifting their best
frequencies (BFs). However, it decreases the excitatory responses of
subcortical neurons tuned to frequencies slightly higher or lower than
61.2 kHz and shifts their BFs away from 61.2 kHz. The BF shifts are
symmetrical and centrifugal around 61.2 kHz. These corticofugal effects
are larger on thalamic neurons than on collicular neurons. The cortical
electrical stimulation sharpens the frequency-tuning curves of
subcortical neurons. These corticofugal effects named "egocentric
selection" last 
2.5 h after the cessation of a 7-min-long cortical
electrical stimulation. In the mustached bat, corticofugal modulation
serves to increase the contrast in neural representation of sound at
~61 kHz, which is an important component of an echo bearing velocity
information. It is also most likely that the corticofugal system plays
an important role in plasticity of the central auditory system. Another
subdivision of the auditory cortex of the mustached bat is called the
FM-FM area. This area consists of delay-tuned combination-sensitive neurons, called FM-FM neurons, and has the echo-delay axis for the
systematic representation of target distances. A focal electric stimulation of the FM-FM area evokes changes in the responses of
collicular and thalamic FM-FM neurons. These changes are basically the
same as those described in the present paper. Therefore corticofugal modulation takes place for frequency domain analysis in exactly the
same way as it does in time domain analysis.
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