Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2008
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| Online Access: | http://hdl.handle.net/1721.1/42252 |
| _version_ | 1811083863378624512 |
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| author | Wang, Grace I |
| author2 | Bertrand Delgutte. |
| author_facet | Bertrand Delgutte. Wang, Grace I |
| author_sort | Wang, Grace I |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007. |
| first_indexed | 2024-09-23T12:40:34Z |
| format | Thesis |
| id | mit-1721.1/42252 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T12:40:34Z |
| publishDate | 2008 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/422522019-04-11T14:25:12Z Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus Wang, Grace I Bertrand Delgutte. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Electrical Engineering and Computer Science. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007. Includes bibliographical references (leaves 73-79). Traditional models for pitch processing have relied either on a purely spatial representation based on the frequency selectivity and frequency-to-place mapping in the cochlea, or on a purely temporal representation dependent on neural phase locking to the stimulus period. However, rate-place cues to the pitch of harmonic complex tones in the auditory nerve (AN) saturate at high levels, and temporal cues fail to predict the strong pitch of resolved harmonics. Thus, neither pitch representation accounts for all key psychophysical observations. Recently, it has been shown that the AN also contains spatio-temporal cues to the individual harmonics of a complex tone that might be used in pitch extraction and are more consistent with psychophysical data (Cedolin 2006) This thesis aims to evaluate whether these cues are extracted in cochlear nucleus (CN) neurons, which receive inputs from AN fibers. We used transient complex stimuli ("Huffman sequences") designed to manipulate the relative timing between adjacent AN fibers to evaluate sensitivity of CN units to the spatio-temporal pattern of their inputs. A small minority of units were sensitive to the stimulus manipulations, with only a few sensitive in the direction consistent with cross-frequency coincidence detection. We also measured the strength of the rate representation for the pitch of harmonic complex tones in CN units and found a few units that maintained salient pitch cues at high stimulus levels. However there was no obvious correlation between spatio-temporal sensitivity and robust pitch cues. Instead of a conversion of spatio-temporal cues in the AN into rate cues, our results indicate that temporal sharpening occurs at the level of the CN. by Grace I. Wang. S.M. 2008-09-03T15:04:58Z 2008-09-03T15:04:58Z 2007 2007 Thesis http://hdl.handle.net/1721.1/42252 231635515 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 79 leaves application/pdf Massachusetts Institute of Technology |
| spellingShingle | Electrical Engineering and Computer Science. Wang, Grace I Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus |
| title | Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus |
| title_full | Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus |
| title_fullStr | Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus |
| title_full_unstemmed | Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus |
| title_short | Spatio-temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus |
| title_sort | spatio temporal representation of the pitch of complex tones in the auditory nerve and cochlear nucleus |
| topic | Electrical Engineering and Computer Science. |
| url | http://hdl.handle.net/1721.1/42252 |
| work_keys_str_mv | AT wanggracei spatiotemporalrepresentationofthepitchofcomplextonesintheauditorynerveandcochlearnucleus |