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Task coordination and aging: explorations of executive control processes in the task switching paradigm
1Department of Psychology, University of Illinois at Urbana Champaign, Beckman Institute, Urbana 61801, USA.
Acta Psychologica
|May 27, 1999
Summary
Older adults showed significant improvements in task switching with practice, matching young adults' performance. However, high memory loads hindered older adults' ability to benefit from practice.
Area of Science:
- Cognitive psychology
- Neuroscience of aging
- Human development
Background:
- Cognitive aging models predict older adults have executive control deficits.
- Executive control is crucial for tasks requiring cognitive flexibility, like task switching.
Purpose of the Study:
- To investigate age-related differences in executive control, specifically within the task switching paradigm.
- To determine how practice and memory load affect task switching performance in young and older adults.
Main Methods:
- Young and older adults performed element number and digit value tasks.
- Switch costs were calculated by comparing reaction times on switch vs. non-switch trials.
- Performance was assessed across practice, a two-month retention period, and varying memory loads.
Main Results:
- Initially, older adults exhibited larger switch costs than young adults.
- With practice, switch costs became equivalent between age groups.
- Older adults demonstrated substantial practice effects on switch trials.
- Age equivalence in switch costs persisted over two months.
- High memory loads eliminated practice benefits for older adults.
Conclusions:
- Cognitive aging is not uniform; older adults can improve executive functions like task switching with practice.
- Memory load is a critical factor modulating the benefits of practice for older adults in executive tasks.
- Findings challenge general cognitive aging models and support process-specific accounts.