Impact of Age on Cognitive Testing Practice Effects and Cardiorespiratory Responses.

Area of Science:

• Neuroscience
• Gerontology
• Physiology

Background:

• Cognitive practice effects, where performance improves with repeated testing, are well-documented.
• Aging may alter these practice effects and associated physiological responses like heart rate (HR) and breathing frequency (BF).
• Understanding these age-related differences is crucial for interpreting cognitive test results in older adults.

Purpose of the Study:

• To investigate whether healthy aging attenuates cognitive practice effects.
• To determine if aging limits familiarity-associated reductions in HR and BF during cognitive retesting.
• To compare cognitive performance and cardiorespiratory responses between younger and older adults.

Main Methods:

• Twenty-one healthy younger (26±1 years) and older (65±2 years) adults participated.
• Cognitive tests (MMSE, DST, TMT-B, CVLT-II) were administered twice over 3 weeks.
• HR and BF were continuously monitored during cognitive testing.

Main Results:

• Cognitive performance was generally unaffected by age, except for the California Verbal Learning Test (CVLT-II), which showed practice effects.
• Heart rate and breathing frequency increased in younger adults during cognitive tests, but not in older adults.
• Retesting attenuated cardiorespiratory responses in younger adults, suggesting habituation.

Conclusions:

• Cognitive practice effects were observed only for the CVLT-II, not other tests, in both age groups.
• Healthy aging did not impair short-term memory or learning.
• Cardiorespiratory responses to cognitive testing, particularly HR, differed significantly between younger and older adults, with younger individuals showing greater responses that habituated with retesting.