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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
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How the healthy ageing brain supports semantic binding during language comprehension
Roksana Markiewicz1,2, Katrien Segaert1,2,3, Ali Mazaheri1,2
1School of Psychology, University of Birmingham, Birmingham, UK.
The European Journal of Neuroscience
|November 15, 2021
Summary
Older adults show delayed and different brain activity patterns for word retrieval and meaning integration compared to younger adults, suggesting altered cognitive processing with age.
Area of Science:
- Cognitive Neuroscience
- Neuroscience of Aging
- Psycholinguistics
Background:
- Semantic binding is crucial for constructing complex meaning from basic word units.
- Understanding age-related changes in brain activity during language processing is vital for cognitive health research.
Purpose of the Study:
- To investigate age-related differences in brain oscillatory activity during lexical retrieval and semantic binding.
- To identify specific neural signatures associated with these cognitive processes in young versus older adults.
Main Methods:
- Utilized electroencephalography (EEG) to record brain activity in young and older adults.
- Presented participants with two-word phrases to elicit lexical retrieval and semantic binding.
- Analyzed modulations in theta, alpha, and beta brainwave frequencies.
Main Results:
- Lexical retrieval showed opposite theta and alpha modulation patterns between age groups, indicating delayed processing in older adults.
- Semantic binding exhibited distinct beta-range oscillatory signatures, with young adults showing an early low-beta increase and older adults a later low- and high-beta decrease.
- These findings highlight age-dependent differences in the timing and neural mechanisms of semantic integration.
Conclusions:
- Healthy aging is associated with distinct and delayed neural signatures for both lexical retrieval and semantic binding.
- The integration of word meaning into context takes longer and involves different neural mechanisms in older adults compared to younger adults.
- These age-related changes in brain activity provide insights into the neurocognitive underpinnings of language processing in aging.
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