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Age-related changes in feature-based object memory retrieval as measured by event-related potentials
Hsueh-Sheng Chiang1, Raksha A Mudar2, Jeffrey S Spence1
1Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA.
Biological Psychology
|June 10, 2014
Summary
Older adults show similar brain activity for successful object retrieval but use more neural resources for effortful searches when retrieval fails, indicating age-related differences in semantic processing.
Area of Science:
- Neuroscience
- Cognitive Aging
- Semantic Memory
Background:
- Aging impacts cognitive functions, including semantic memory.
- Understanding neural mechanisms of semantic processing in older adults is crucial.
Purpose of the Study:
- To investigate age-related differences in neural mechanisms supporting semantic functions.
- To compare brain activity during object retrieval tasks between younger and older adults.
Main Methods:
- Scalp electroencephalography (EEG) recording.
- Object retrieval task involving visual word stimuli representing object features.
- Comparison of neural potentials between younger (22) and older (22) adults.
Main Results:
- Comparable accuracy in object retrieval between age groups.
- Longer response times observed in older adults.
- Older adults exhibited an additional late positive frontal potential during failed retrieval, suggesting increased neural resource engagement.
Conclusions:
- Younger and older adults utilize similar neural mechanisms for successful object memory retrieval.
- Older adults engage additional neural resources for more effortful search processes when retrieval is unsuccessful.
- Findings highlight age-related differences in cognitive control and search strategies during semantic tasks.
