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The Journal of Neurophysiology Vol. 87 No. 1 January 2002, pp. 516-527
Copyright ©2002 by the American Physiological Society
1W. M. Keck Center for Integrative Neuroscience and 2UCSF/UCB Bioengineering Group, University of California Medical Center, San Francisco 94143; 3Helen Wills Neuroscience Institute, University of California, Berkeley, California 94720; and 4Electrical and Computer Engineering, Bioengineering, University of Connecticut, Storrs, Connecticut 06269
Miller, Lee M.,
Monty A. Escabí,
Heather L. Read, and
Christoph E. Schreiner.
Spectrotemporal Receptive Fields in the Lemniscal Auditory
Thalamus and Cortex. J. Neurophysiol. 87: 516-527, 2002. Receptive fields have been characterized independently
in the lemniscal auditory thalamus and cortex, usually with
spectrotemporally simple sounds tailored to a specific task. No studies
have employed naturalistic stimuli to investigate the thalamocortical
transformation in temporal, spectral, and aural domains simultaneously
and under identical conditions. We recorded simultaneously in the
ventral division of the medial geniculate body (MGBv) and in primary
auditory cortex (AI) of the ketamine-anesthetized cat. Spectrotemporal receptive fields (STRFs) of single units (n = 387) were
derived by reverse-correlation with a broadband and dynamically varying stimulus, the dynamic ripple. Spectral integration, as measured by
excitatory bandwidth and spectral modulation preference, was similar
across both stations (mean Q1/e thalamus = 5.8, cortex = 5.4; upper cutoff of spectral modulation transfer
function, thalamus = 1.30 cycles/octave, cortex = 1.37 cycles/octave). Temporal modulation rates slowed by a factor of two
from thalamus to cortex (mean preferred rate, thalamus = 32.4 Hz,
cortex = 16.6 Hz; upper cutoff of temporal modulation transfer
function, thalamus = 62.9 Hz, cortex = 37.4 Hz). We found no
correlation between spectral and temporal integration properties,
suggesting that the excitatory-inhibitory interactions underlying
preference in each domain are largely independent. A small number of
neurons in each station had highly asymmetric STRFs, evidence of
frequency sweep selectivity, but the population showed no directional
bias. Binaural preferences differed in their relative proportions, most
notably an increased prevalence of excitatory contralateral-only cells
in cortex (40%) versus thalamus (23%), indicating a reorganization of
this parameter. By comparing simultaneously along multiple stimulus
dimensions in both stations, these observations establish the global
characteristics of the thalamocortical receptive field transformation.
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