Longitudinal age changes in vigilance over an eighteen year interval.

Area of Science:

• Neuroscience
• Psychology
• Gerontology

Background:

• Vigilance is crucial for tasks requiring sustained attention.
• Previous cross-sectional studies suggested age-related declines in vigilance.
• Longitudinal data are needed to confirm age-related changes in cognitive function.

Purpose of the Study:

• To investigate longitudinal changes in vigilance performance.
• To examine the relationship between skin potential response latencies (SPRL) and reaction times over 18 years.
• To identify the age at which significant vigilance decline occurs.

Main Methods:

• An 18-year longitudinal study replicating the Mackworth Clock vigilance task.
• Measurement of skin potential response latencies (SPRL) and reaction times in 33 men.
• Comparison of performance across different age groups and over time.

Main Results:

• Longitudinal changes mirrored cross-sectional findings.
• Individuals aged 70-88 exhibited slower reaction times compared to younger groups.
• Older adults (70-88) detected significantly fewer targets than when younger.
• Changes in SPRL correlated with observed vigilance decline, though influenced by time-of-measurement effects.

Conclusions:

• A noticeable reduction in vigilance performance occurs around age 70.
• This decline is associated with reduced autonomic and central nervous system reactivity.
• Longitudinal findings confirm age-related decrements in sustained attention and cognitive processing speed.