Neuroscience 2003 Abstract
| Presentation Number: | 486.4 |
|---|---|
| Abstract Title: | Within-channel and across-channel temporal gap performance in normal, aged and APD affected participants. |
| Authors: |
Estes, R. I.*1
; Jerger, J. F.2
1Sch. Occup. Therapy, TX Woman's Univ, Denton, TX 2TX, 1908 Southridge Dr, 76205, |
| Primary Theme and Topics |
Sensory Systems - Auditory -- Central physiology |
| Session: |
486. Auditory Cortex II Poster |
| Presentation Time: | Monday, November 10, 2003 4:00 PM-5:00 PM |
| Location: | Morial Convention Center - Hall F-I, Board # G1 |
| Keywords: | AGING, AUDITORY, ELECTROPHYSIOLOGY, EVOKED POTENTIALS |
Past studies have shown that within-channel auditory gap detection tasks are processed by the auditory periphery whereas across-channel auditory gap detection tasks require the intervention of central processes. Previously, we found a left-hemispheric bias for a within-channel task and a right hemispheric bias for an across-channel task (Estes & Jerger, 2002 SFN abstract). This result implies that spatial perception rather than temporal resolution dominates the across-channel task. Two studies are presented here; the purpose of the first study was to investigate differences in across-channel gap detection in three different age groups. The purpose of the second study was to investigate whether boys with an auditory processing disorder (APD) exhibited an electrophysiological response different in latency or amplitude from boys with no auditory processing disorder on within and across-channel temporal gap detection tasks.
In the age-related study there were 30 right-handed participants (11 boys, 10 young men and 9 older men). The electrophysiological response investigated was the event-related potential evoked by the presence of a gap. Boys and older men were found to have longer latency responses than young men. A stair-step effect was found for amplitude differences with older men showing the smallest amplitude response, boys the largest amplitude and young men a mid-range response. In the APD-related study there were 24 right-handed participants (13 APD, 11 non-APD). The electrophysiological response investigated was the event-related potential evoked by the presence of a gap. No significant difference between groups was found for response latency for either task. Amplitude responses were significantly greater in the APD group than in the control group for both gap tasks. This result implies that children with APD may have both temporal and spatial auditory processing difficulties.
In the age-related study there were 30 right-handed participants (11 boys, 10 young men and 9 older men). The electrophysiological response investigated was the event-related potential evoked by the presence of a gap. Boys and older men were found to have longer latency responses than young men. A stair-step effect was found for amplitude differences with older men showing the smallest amplitude response, boys the largest amplitude and young men a mid-range response. In the APD-related study there were 24 right-handed participants (13 APD, 11 non-APD). The electrophysiological response investigated was the event-related potential evoked by the presence of a gap. No significant difference between groups was found for response latency for either task. Amplitude responses were significantly greater in the APD group than in the control group for both gap tasks. This result implies that children with APD may have both temporal and spatial auditory processing difficulties.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2003 Neuroscience Meeting Planner. New Orleans, LA: Society for Neuroscience, 2003. Online.
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