Does numerical similarity alter age-related distractibility in working memory?

Area of Science:

• Cognitive Neuroscience
• Experimental Psychology
• Aging Research

Background:

• Distractibility in visual working memory (vWM) significantly impacts older adults.
• Numerical similarity between stimuli is a potential factor influencing distractibility.

Purpose of the Study:

• To investigate the role of numerical similarity in generating distractibility within vWM.
• To examine age-related differences in vWM performance and resource allocation.

Main Methods:

• EEG study using a change detection paradigm with varying numbers of relevant and irrelevant stimuli.
• Behavioral measures and electrophysiological recordings (Contralateral Delay Activity, alpha-band lateralization) were analyzed.
• Participants included both young and older adults.

Main Results:

• Younger participants outperformed older adults, but numerical similarity did not affect performance in either group.
• In older adults, task performance was modulated by the total number of items, unlike in younger adults.
• Older adults demonstrated a lack of selective attentional and vWM resource deployment to relevant visual fields.

Conclusions:

• Numerical similarity does not appear to be a significant factor in vWM distractibility.
• Age-related changes involve a redistribution of vWM resources, leading to decreased performance in older adults.
• Older adults exhibit impaired selective attention and resource allocation in vWM tasks.