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  Acoustic parameters underlying vocalization-sensitive neural responses in Rhesus monkey auditory cortex

Ghanzafar, A., Leopold, D., Hauser, M., & Logothetis, N. (2003). Acoustic parameters underlying vocalization-sensitive neural responses in Rhesus monkey auditory cortex. Poster presented at 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003), New Orleans, LA, USA.

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Ghanzafar, AA1, 2, Author              
Leopold, DA1, 2, Author              
Hauser, MD, Author
Logothetis, NK1, 2, Author              
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1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: The vocal behavior of macaque monkeys has been studied extensively in both field and laboratory settings. To date, however, no investigation has systematically examined the neural mechanisms underlying species-specific recognition of their vocalizations. To bridge this gap, we are investigating the auditory representation of conspecific vocalizations in the neocortex of behaving rhesus monkeys. Subjects performed a simple auditory detection task during which, on each trial, they listened to a conspecific vocalization followed by a non-vocal, target sound. The stimulus set consisted of call types familiar to our captive-bred subjects but from unknown individuals: three exemplars from each of 7 call categories. Our preliminary investigation using these natural stimuli (Ghazanfar et al, SFN 2002) revealed that ~45 of auditory belt cortical multi-units were selective for 1 or 2 call categories. This suggests that the macaque auditory cortex is specialized to process communication sounds. To assess the degree of this specialization and the specificity of vocalization-sensitivity, we are comparing single-unit responses to vocalizations with time-reversed versions, pure-tones and band-passed noise. For each vocalization, a pure-tone and a band-passed noise stimulus were generated to match the signal’s duration, dominant frequency and average RMS power. Recordings from both core and belt cortical areas will determine whether vocalization-sensitive neurons in these regions are driven by simple features of the signal or by more complex interactions between spectral and temporal properties.

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 Dates: 2003-11
 Publication Status: Published online
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 Identifiers: BibTex Citekey: GhanzafarLHL2003
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Title: 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003)
Place of Event: New Orleans, LA, USA
Start-/End Date: 2003-11-08 - 2003-11-12

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Title: 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 181.14 Start / End Page: - Identifier: -