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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
Published on: June 25, 2019
Age-related declines in context maintenance and semantic short-term memory
Henk J Haarmann1, Gemma E Ashling, Eddy J Davelaar
1Center for the Advanced Study of Language, University of Maryland, College Park, MD 20742, USA. hhaarmann@comcast.net
Summary
Older adults show declines in maintaining context and semantic short-term memory (STM). These cognitive functions are linked, with age significantly impacting both context maintenance and semantic STM performance.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Aging Research
Background:
- Cognitive functions like context maintenance and semantic short-term memory (STM) are crucial for daily functioning.
- Previous research suggests potential age-related changes in various cognitive domains, but the specific relationship between context maintenance and semantic STM across the lifespan requires further investigation.
Purpose of the Study:
- To investigate age-related differences in context maintenance and semantic short-term memory.
- To examine the relationship between context maintenance and semantic STM abilities in younger and older adults.
- To determine if age mediates the association between these cognitive functions.
Main Methods:
- Participants: Younger and older adult groups.
- Tasks: AX-Continuous Performance Task (AX-CPT) for context maintenance, conceptual span for semantic STM, digit span for phonological STM, and semantic anomaly judgment for meaning integration.
- Procedure: Assessed performance across tasks with varying interference levels in the AX-CPT.
Main Results:
- Older adults exhibited significant deficits in context maintenance compared to younger adults.
- Age-related declines were also found in conceptual span and semantic anomaly judgment, but not in digit span.
- Context maintenance performance was positively correlated with conceptual span and semantic anomaly judgment, with these relationships largely explained by age differences.
Conclusions:
- Age-related cognitive decline affects context maintenance and semantic short-term memory.
- The findings highlight a significant link between context maintenance and semantic processing, which is influenced by aging.
- Age is a critical factor explaining the observed relationship between context maintenance and semantic STM, suggesting a common underlying aging mechanism.
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