[Distracter inhibition in mild cognitive impairment]

Area of Science:

• Cognitive Neuroscience
• Gerontology
• Psychology

Background:

• Cognitive aging affects inhibitory control and processing speed.
• Mild cognitive impairment (MCI) presents challenges in distinguishing normal aging from pathological changes.

Purpose of the Study:

• To investigate visual stimulus inhibition using the flanker task in young, old, and MCI groups.
• To analyze reaction times and diffusion model parameters to understand aging-related cognitive changes.

Main Methods:

• Flanker task to assess inhibitory control.
• Analysis of reaction times and accuracy.
• Application of the diffusion model to reaction times.

Main Results:

• Older adults and MCI patients exhibited slower reaction times and lower accuracy, particularly with incongruent distractors.
• Perceptual-motor processes were prolonged in older age.
• Reduced processing speed was specific to pathological aging (MCI).
• Increased response conservativeness drove performance decrements in MCI patients.

Conclusions:

• MCI involves both normal and pathological aging processes.
• Perceptual-motor slowing reflects normal aging; processing speed slowing indicates pathological aging.
• Reaction time component analysis aids in differentiating normal and pathological cognitive aging.
• Response conservativeness is a key factor in slowed reaction times across aging types.