The CRUNCH model does not account for load-dependent changes in visuospatial working memory in older adults

Area of Science:

• Neuroimaging
• Cognitive Neuroscience
• Gerontology

Background:

• Older adults often exhibit greater brain activation than younger adults during cognitive tasks, interpreted as cognitive compensation.
• The Compensation-Related Utilisation of Neural Circuits (CRUNCH) model posits that this increased activation reverses at higher task difficulties.

Purpose of the Study:

• To test the predictions of the CRUNCH model in older versus younger adults using a visuospatial working memory task.
• To systematically review existing literature on the CRUNCH model in healthy aging.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity during a visuospatial working memory task.
• A systematic literature review was conducted on studies examining the CRUNCH model in healthy aging.

Main Results:

• fMRI activity in older adults compared to younger adults was in the opposite direction to that predicted by the CRUNCH model.
• A review revealed a small number of studies (4) have empirically tested the CRUNCH model's predictions.

Conclusions:

• The findings challenge the CRUNCH model's predictions in the context of visuospatial working memory.
• Further experimental research is necessary to validate the CRUNCH model in the field of cognitive aging.