Document Detail

Neuronal representation of pitch ambiguity.
MedLine Citation:
PMID:  18531869     Owner:  NLM     Status:  In-Data-Review    
Iterated rippled noise (IRN) is produced by delaying a broadband noise by time d, multiplying by gain g, adding the delayed noise to the original, and repeating this process for n iterations. When g=+1 IRN has a well-defined pitch at 1d Hz. If g=-1 the pitch can be ambiguous. A gain of -1 is equivalent to applying a frequency-independent phase shift phi of pi rads to the delayed noise (g=+1 identical with phi=0). We recorded spike-trains from single units in the ventral cochlear nucleus in response to IRN with varying phi. Units with high best frequencies represented waveform envelope modulation (independent of phi), however, units in the phase-locking range of best frequencies represented stimulus fine structure (which varies with phi). Fine structure responders show a gradual transition from a well-defined peak in the interspike interval distribution at d when phi=0 to two equal-amplitude peaks flanking d when phi=pi, and a gradual shift back to a well-defined peak at d as phi approaches 2pi. Within the dominance region for pitch interspike interval distributions account for psychophysical pitch matches of 1.07d and 0.94d Hz for phi=pi2 and 32pi respectively, as well as the ambiguous pitches of 0.88d, 1.14d, and 12d Hz heard when phi=pi rads.
Mark Sayles; Ian M Winter
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  123     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-06-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3715     Citation Subset:  IM    
Centre for the Neural Basis of Hearing, The Physiological Laboratory, Downing Street, CB2 3EG Cambridge, UK,
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