Middle-latency responses were obtained using chained-stimuli as a means of estimating audiometric threshold in a more time efficient manner. The stimulus chains consisted of first a quiet 33 mS interval, then 5 tone pips, each of 15 dB greater intensity than the preceding tone pip. The onsets of the tone pips were separated by 33 mS. Each 200 mS computer averaging sweep recorded the neural activity evoked by these 5 stimuli. The resulting trace reflected the first portion of five sequential middle-latency responses. Thresholds obtained using chained-stimuli were compared to those obtained using conventional middle-latency procedures and to voluntary thresholds. Both 500 Hz and 2000 Hz thresholds were assessed. It was found that the mean chained-stimuli thresholds were 6 to 8 dB higher than conventional middle-latency thresholds and 25 to 30 dB higher than behavioral thresholds. Testing using chained-stimuli was completed in slightly over 1/3 the time required for conventional middle-latency procedures, documenting the time efficiency of this method of testing. The possibility of obtaining responses at lower sensation levels by using 100-3000 Hz filtering of the physiologic responses while observing earlier latency potentials, or by slowing the repetition rate of the stimulus chain were discussed. / Source: Dissertation Abstracts International, Volume: 47-12, Section: B, page: 4816. / Thesis (Ph.D.)--The Florida State University, 1986.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_76003 |
| Contributors | HAMILL, TERESA ANNE., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 200 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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