Cortical configuration by stimulus onset visual evoked potentials (SO-VEPs) predicts performance on a motion...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Cognitive aging is characterized by slowed information processing.
• Previous studies on motion onset visual evoked potentials (MO-VEPs) in older adults showed prolonged non-decision time but no correlation with electrophysiological measures.
• The role of early visual encoding in age-related cognitive slowing requires further investigation.

Purpose of the Study:

• To investigate the impact of aging on the encoding and perceptual processing stages of visual information using stimulus onset visually evoked potentials (SO-VEPs).
• To determine if SO-VEP parameters correlate with behavioral measures of information processing speed in older adults.

Main Methods:

• Electroencephalography (EEG) recording during a motion direction discrimination task in young (<55 years) and elderly (>55 years) healthy adults.
• Analysis of stimulus onset visually evoked potentials (SO-VEPs), focusing on P1, N1, and P2 components.
• Correlation analysis between SO-VEP parameters (amplitude, latency) and behavioral measures (response time, diffusion model parameters).

Main Results:

• Elderly participants exhibited increased P1 amplitude and reduced P2 amplitude in SO-VEPs compared to younger adults.
• Increased latencies for P1 and N1 components were observed in elderly individuals.
• SO-VEP parameters significantly predicted behavioral response times and diffusion model parameters, unlike MO-VEP findings.

Conclusions:

• Age-related slowing of information processing originates early in visual cortical encoding, likely in striate and extrastriate areas.
• Early SO-VEP components, reflecting visual cortex configuration and encoding, are crucial predictors of subsequent cognitive processing delays in aging.
• Electrophysiological measures of early visual processing offer valuable insights into the mechanisms underlying cognitive aging.