Reduced distractor filtering with age: Evidence from the distractor positivity ERP

Area of Science:

• Cognitive Neuroscience
• Developmental Psychology
• Aging Research

Background:

• Behavioral studies show similar attentional cue use in young and older adults.
• Cognitive and neural mechanisms may differ with age, despite comparable behavioral outcomes.

Purpose of the Study:

• To investigate age-related differences in the neural underpinnings of attentional filtering.
• To determine if older adults utilize distinct neural mechanisms for attentional control compared to younger adults.

Main Methods:

• Utilized event-related potentials (ERPs) to examine neural activity during attentional filtering.
• Presented young and older adults with positive, negative, or neutral cues before a visual search task.
• Measured response times (RTs) and specific ERP components (N2pc, P$_{D}$) to assess attentional selection and distractor suppression.

Main Results:

• Both age groups showed enhanced target selection (N2pc) with positive cues.
• Young adults demonstrated significant distractor suppression (P$_{D}$) across all cue types.
• Older adults failed to show significant distractor suppression and exhibited increased attention to distractors under negative and neutral cues.

Conclusions:

• Behavioral similarity in attentional cue use between age groups masks underlying neural differences.
• Older adults exhibit reduced neural capacity for distractor suppression compared to younger adults.
• Age impacts the neural mechanisms of attentional filtering, particularly in inhibiting irrelevant information.