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J Neurophysiol (January 1, 2003). 10.1152/jn.00088.2002
Submitted on Submitted 7 February 2002; accepted in final form 3 September 2002
Department of Psychology, University of California, Berkeley, California 94720-1650
Grace, Julie A.,
Noopur Amin,
Nandini C. Singh, and
Frédéric E. Theunissen.
Selectivity for Conspecific Song in the Zebra Finch
Auditory Forebrain. J. Neurophysiol. 89: 472-487, 2003. The selectivity of neurons in the zebra finch
auditory forebrain for natural sounds was investigated systematically.
The principal auditory forebrain area in songbirds consists of the
tonotopically organized field L complex, which, by its location in the
auditory processing stream, can be compared with the auditory cortex of mammals. We also recorded from a secondary auditory area, cHV. Field L
and cHV are auditory processing stages that are presynaptic to the
specialized song system nuclei where auditory neurons show an extremely
selective response for the bird's own song, but weak response to
almost any other sounds, including conspecific songs. In our study, we
found that neurons in field L and cHV had stronger responses to
conspecific song than to synthetic sounds that were designed to match
the lower order acoustical properties of song, such as their overall
power spectra and AM spectra. Such preferential responses to natural
sounds cannot be explained by linear frequency tuning or simple
nonlinear intensity tuning and requires linear or nonlinear
spectro-temporal neuronal transfer functions tuned to the acoustical
properties of song. The selectivity for conspecific songs in field L
and cHV might reflect an intermediate auditory processing stage for
vocalizations that then contributes to the generation of the very
specific selectivity for the bird's own song seen in the postsynaptic
song system.
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