Visual target processing in high- and low-performing older subjects indexed by P3 component

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• The P3 event-related potential (ERP) component is a marker of cognitive processing, particularly in attention and working memory.
• Aging can affect cognitive functions, including visual attention, with varying performance levels observed in older adults.

Purpose of the Study:

• To investigate age-related changes in P3 ERP parameters in relation to performance on a visual attention task.
• To differentiate cognitive processing between high- and low-performing older adults compared to young adults.

Main Methods:

• Conventional and single-trial analyses of the visual P3 component were conducted.
• Participants were divided into young and older healthy groups, further categorized as high- or low-performers based on a visual attention task.

Main Results:

• P3 latency increased significantly with age.
• Low-performing older adults exhibited reduced P3 amplitude at posterior sites and more widespread brain activity compared to high-performing older and young subjects.
• Single-trial analysis revealed higher P3 latency variability and fewer trials with P3 generation in low-performing older adults.

Conclusions:

• Data suggest a specific decline in visual target processing in low-performing older adults, indicating reduced attentional brain resources for stimulus selection.
• Findings contribute to the debate on compensation versus dedifferentiation in normal aging processes.