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Age-related differences in novelty and target processing among cognitively high performing adults
Kirk R Daffner1, Katherine K Ryan, Danielle M Williams
1Brigham Behavioral Neurology Group, Division of Cognitive and Behavioral Neurology, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. kdaffner@partners.org
Neurobiology of Aging
|August 2, 2005
Summary
Cognitively high-performing older adults show no age-related differences in event-related potential (ERP) processing of novel stimuli. This suggests cognitive status is key to understanding age-related changes in brain activity.
Area of Science:
- Cognitive Neuroscience
- Gerontology
- Psychophysiology
Background:
- Previous studies on age-related changes in event-related potentials (ERPs) often fail to control for cognitive status.
- This oversight may explain findings like increased P3 latency and decreased P3 amplitude in older adults.
Purpose of the Study:
- To investigate age-associated differences in P3 component of ERPs.
- To examine ERPs in response to novel and target stimuli in cognitively high-performing older adults.
Main Methods:
- A novelty oddball paradigm was used with young, middle-aged, and cognitively high-performing old adults.
- Participants were matched for IQ, education, and gender.
- P3 latency, amplitude, and scalp distribution were analyzed.
Main Results:
- No significant age-associated differences in P3 latency were observed.
- Older adults exhibited larger, more anterior P3 amplitudes across all stimulus types.
- After controlling for non-specific processing differences, P3 amplitude and distribution for novel and target stimuli were comparable across age groups.
Conclusions:
- Cognitive status is a critical factor in age-related ERP research.
- Cognitively high-performing older adults do not show age-specific deficits in processing novel and target stimuli as indexed by the P3 component.
- Age-related differences in P3 may reflect increased resource utilization in older adults.