Saccadic eye movements: what do they tell us about aging cognition?

Area of Science:

• Neuroscience
• Cognitive Psychology
• Ophthalmology

Background:

• Age-related cognitive decline is a significant concern, with links to saccadic eye movement (SEM) deficits previously noted.
• However, the precise cognitive changes underlying age-related alterations in SEM performance remain incompletely understood.
• Understanding these links can provide insights into the aging brain's functional changes.

Purpose of the Study:

• To investigate the specific cognitive factors contributing to age-related changes in SEM performance.
• To compare SEMs in younger and older adults across different task conditions (prosaccade and antisaccade).
• To examine the relationship between SEM performance and neuropsychological scores.

Main Methods:

• Compared SEMs in younger adults (YA), older adults under 65 (OA<65), and older adults over 65 (OA>65).
• Utilized prosaccade (PS) and antisaccade (AS) tasks under gap, step, and overlap conditions.
• Administered a neuropsychological evaluation to assess cognitive functions.

Main Results:

• Saccadic latencies, antisaccade (AS) cost, time to correct AS errors, and uncorrected AS increased with age.
• Younger adults exhibited greater overlap effects compared to both older adult groups.
• SEM performance, particularly latencies and AS cost, correlated significantly with processing speed, inhibition, and cognitive flexibility measures.

Conclusions:

• Progressive age-related decline in processing speed and executive attention is associated with SEM alterations.
• Prosaccade (PS) and antisaccade (AS) tasks can effectively highlight these age-related cognitive changes.
• SEM performance serves as a sensitive indicator of cognitive aging.