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What cochlear implants can tell us about pitch perception in normal hearing
| Content Provider | Semantic Scholar |
|---|---|
| Author | Swanson, Brett A. McDermott, Hugh J. |
| Copyright Year | 2010 |
| Abstract | Temporal models of pitch perception postulate that pitch depends on auditory nerve inter-spike interva ls. Such models were assessed with cochlear implant recipients by stimulating via a single electrode with two dist inct pulse timing patterns. Pitch-ranking results using on-off modula ted pulse trains were not consistent with a publish ed autocorrelation model, but were consistent with an alte rnative model that analyses first-order inter-spike intervals. Place of stimulation cues were investigated by choosing a fixed pulse rate, high enough to avoid temporal cu es (1800 pps), and then varying the electrodes that were activated . Pitch-ranking results suggested that when a group of neighbouring electrodes was activated, the percept depended on the centroid of the stimulation pattern. This is similar to a model of brightness (timbre) perception in normal h earing. Cochlear implant recipients performed a melo dy perception test with melodies presented by (i) varying th e pulse rate on a single electrode (temporal cues o nly), and (ii) varying the centroid of the stimulation pattern (pl ace cues only). Scores were worse than those of nor mal-hearing subjects listening to tones containing only resolve d harmonics, but similar to those obtained with unr esolved harmonics. Such tones contain only temporal cues to pitch and evoke a weak pitch sensation. Given the dissim ilarities in the neural firing patterns, it is surprising that place cues alone and temporal cues alone can each provid e useful information about melodic pitch. |
| Starting Page | 3348 |
| Ending Page | 3353 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.acoustics.asn.au/conference_proceedings/ICA2010/cdrom-ICA2010/papers/p889.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
