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An Experimental Paradigm for Measuring the Effects of Ageing on Sentence Processing
Published on: October 25, 2019
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Modulation of the inter-hemispheric processing of semantic information during normal aging. A divided visual field
E Hoyau1, E Cousin2, A Jaillard3
1University Grenoble Alpes, LPNC, F-38040 Grenoble, France; CNRS, LPNC UMR 5105, F-38040 Grenoble, France.
Neuropsychologia
|January 3, 2016
Summary
Aging impacts semantic processing by increasing left hemisphere involvement, though the right hemisphere retains some abilities. This suggests a complex interplay of mechanisms rather than a single model explaining cognitive changes.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Aging Research
Background:
- Normal aging affects inter-hemispheric processing of semantic information.
- Existing models include the HAROLD model and RH decline theory.
- Understanding these changes is crucial for cognitive aging research.
Purpose of the Study:
- To evaluate the effect of normal aging on inter-hemispheric semantic processing.
- To compare semantic processing in young and old adults.
- To test predictions of the HAROLD model and RH decline theory.
Main Methods:
- Used the divided visual field (DVF) method with words and pictures.
- Employed unilateral and bilateral visual field presentations.
- Assessed hemispheric specialization (HS) and inter-hemispheric cooperation (IHC).
Main Results:
- Older adults performed semantic categorization as accurately but more slowly than young adults.
- A non-semantic right hemisphere (RH) decline was observed.
- The left hemisphere (LH) controlled semantic processing during bilateral presentation, suggesting increased LH role in aging.
Conclusions:
- Neither the HAROLD model nor the RH decline theory fully explains the observed results.
- Aging's effect on semantic processing involves an interaction of complementary mechanisms.
- The RH retains some semantic abilities despite increased LH involvement in older adults.
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