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- W421012316 abstract "OBJECTIVE: To investigate the role of task load and executive capacity (EC) in age-related increases in early processing of task-irrelevant auditory stimuli. BACKGROUND: Age-related increases in N1 amplitude to task-irrelevant auditory stimuli presented under ignore conditions have been interpreted as reflecting diminished inhibitory capacity. If so, one might predict that N1 amplitude would be augmented by increasing task demands, and attenuated in individuals with high EC. DESIGN/METHODS: ERPs were measured in young, middle aged, young-old, and old-old adults, divided into high and average EC groups based on neuropsychological testing. Subjects were exposed to both auditory (repetitive pure tone, rare pure tone, rare novel) and visual (repetitive letters, infrequent letters) stimuli. Under the auditory-ignore (visual-attend) condition, subjects were instructed to ignore auditory stimuli and respond to rare target letters, under low and high task load. Under the auditory-attend condition, subjects were instructed to ignore visual stimuli and respond to rare target tones. RESULTS: N1 amplitude to novel and repetitive auditory stimuli was larger under the auditory-ignore than auditory-attend conditions for all age groups except young adults. There was an age-related an increased N1 under the auditory-ignore condition beginning at middle-age, but no age differences under the auditory-attend condition. EC modulated the pattern of response only among old-old subjects. Increasing the number of targets under the visual-attend condition was associated with a reduced N1 to task-irrelevant auditory stimuli in all groups. CONCLUSIONS: The study’s findings do not neatly fit the inhibitory-deficit hypothesis of cognitive aging. Augmenting visual task load led to decreased, not increased, N1 to task-irrelevant auditory events. Executive capacity played a limited role in modulating the N1 response. Older adults did not simply fail to suppress the N1 amplitude to auditory stimuli in the task-irrelevant modality; they actually generated a larger response than to identical stimuli in the task-relevant modality. Disclosure: Dr. Daffner has nothing to disclose. Dr. Tusch has nothing to disclose. Dr. Fox has nothing to disclose. Dr. Porto has nothing to disclose. Dr. Alperin has nothing to disclose. Dr. Holcomb has nothing to disclose." @default.
- W421012316 created "2016-06-24" @default.
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- W421012316 date "2015-04-06" @default.
- W421012316 modified "2023-10-17" @default.
- W421012316 title "Increased early processing of task-irrelevant auditory stimuli in older adults (P1.203)" @default.
- W421012316 hasPublicationYear "2015" @default.
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