Journal
JOURNAL OF NEUROPHYSIOLOGY
Volume 97, Issue 5, Pages 3544-3553Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jn.01162.2006
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Funding
- NIDCD NIH HHS [DC-007690, R01 DC007690, R01 DC000134, R01 DC007690-02, DC-00134] Funding Source: Medline
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Performing sound recognition is a task that requires an encoding of the time-varying spectral structure of the auditory stimulus. Similarly, computation of the interaural time difference (ITD) requires knowledge of the precise timing of the stimulus. Consistent with this, low-level nuclei of birds and mammals implicated in ITD processing encode the ongoing phase of a stimulus. However, the brain areas that follow the binaural convergence for the computation of ITD show a reduced capacity for phase locking. In addition, we have shown that in the barn owl there is a pooling of ITD-responsive neurons to improve the reliability of ITD coding. Here we demonstrate that despite two stages of convergence and an effective loss of phase information, the auditory system of the anesthetized barn owl displays a graceful transition to an envelope coding that preserves the spectrotemporal information throughout the ITD pathway to the neurons of the core of the central nucleus of the inferior colliculus.
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