Changes in visuospatial attention over the adult lifespan

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Aging Research

Background:

• Visual attention shifts are crucial for cognitive tasks.
• Aging can impact attentional processes, but the extent is debated.
• Previous studies suggest dementia significantly impairs attention shifting.

Purpose of the Study:

• To investigate how normal adult aging affects visual attention shifts.
• To compare age-related changes in detection versus discrimination tasks.
• To examine the influence of cue location and stimulus-onset asynchrony (SOA) on attention shifts across age groups.

Main Methods:

• Studied 90 adults aged 20s-70s performing visual detection and letter discrimination.
• Utilized valid, invalid, and neutral spatial cues presented centrally or peripherally.
• Varied stimulus-onset asynchrony (SOA) at 200, 500, and 2000 msec.
• Measured reaction time (RT) costs and benefits associated with spatial cueing.

Main Results:

• RT costs and benefits did not vary with age for detection tasks or peripheral cues in discrimination tasks.
• Age effects emerged for central cues in discrimination tasks at SOAs > 200 msec.
• RT costs and benefits increased with age for longer SOAs (500 and 2000 msec).
• The efficiency of voluntary attention shifts showed resistance to aging up to 79 years.

Conclusions:

• Normal aging has a limited impact on voluntary visuospatial attention shifts.
• Age-related effects on attention are task- and cue-dependent.
• Findings suggest a qualitative difference between normal aging and dementia's effects on attention.