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Volume 16, Number 21,
Issue of November 1, 1996
pp. 6987-6998
Copyright ©1996 Society for Neuroscience
Hierarchical Organization of Auditory Temporal Context
Sensitivity
Received March 14, 1996; revised July 8, 1996; accepted July 24, 1996.
Michael S. Lewicki and
Benjamin J. Arthur
Computation and Neural Systems Program, California Institute of
Technology, Pasadena, California 91125
Some of the most complex auditory neurons known are contained
in the songbird forebrain nucleus HVc. These neurons are highly
sensitive to auditory temporal context: they respond strongly to the
bird's own song, but respond weakly or not at all when the sequence of
the song syllables is altered. It is not known whether this property
arises de novo in HVc or whether it is relayed from the
properties of neurons in afferent nuclei. To address this issue, we
recorded from neurons in both HVc and its afferent nuclei, collectively
called field L. Experimental tests were designed to determine the
degree of auditory context sensitivity in field L and HVc. Tests were
also performed to compare the responses to individual syllables and
syllable combinations to see whether these responses could account for
the response seen to the entire song.
Our results show a substantial increase in the auditory temporal
context sensitivity between field L and HVc. Most field L neurons
respond equally well both to normal song and to temporally manipulated
versions of the same song. A few field L neurons show sensitivity to
local temporal structure, such as the sequence of syllable pairs. In
contrast, HVc neurons are highly dependent on the song's local and
global temporal structure. This shows that HVc neurons can integrate
auditory context over periods much longer than neurons in field L and
suggests that additional mechanisms are required to explain the marked
sensitivity of HVc neurons to the temporal structure of the bird's own
song.
Key words:
hierarchical organization;
auditory response properties;
neural integration;
context sensitivity;
order sensitivity;
song
system;
field L;
HVc
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