Abstract:
:Ignoring irrelevant information becomes more difficult with increasing age. The present cross-sectional study addressed this issue by investigating age-related differences in the ability to withhold a response to non-target stimuli. Fourteen young (20-34 years) and 14 elderly (60-80 years) participants performed two go/nogo tasks (simple vs. complex). In the simple task the subjects responded to red O and blue X (target go stimuli) while withholding responses to the blue O and red X (conflict nogo stimuli) and to numbers of either color (irrelevant nogo stimuli). In the complex version, 4 vowels and 4 consonants were used instead of O and X. Accuracy, response times (RTs) and event-related potentials (ERPs) were recorded. Both young and elderly groups made more commission errors to conflict nogo stimuli (mean 5% and 8% in the simple and complex tasks, respectively, age differences not significant) than to irrelevant nogo stimuli (mean<1%), indicating difficulty in withholding a response when a pertinent stimulus feature (letter identity) was shared with the go stimuli. In addition to later RTs to go stimuli and later P3 waves for the conflicting stimuli than the young group, elderly participants showed a very prominent left posterior P2 and a large pre-central P3 to the irrelevant nogo stimuli. These findings suggest that elderly have difficulty in ignoring irrelevant nogo stimuli even when they are easily distinguishable from the go stimuli.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Vallesi A,Stuss DT,McIntosh AR,Picton TWdoi
10.1016/j.neuropsychologia.2008.10.018subject
Has Abstractpub_date
2009-01-01 00:00:00pages
577-86issue
2eissn
0028-3932issn
1873-3514pii
S0028-3932(08)00416-8journal_volume
47pub_type
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