Gains in fluid ability performance and their relationship to cortisol

Area of Science:

• Neuroendocrinology
• Cognitive Psychology
• Gerontology

Background:

• Cortisol, a stress hormone, is implicated in cognitive function.
• Previous research linked serum cortisol to cognitive performance.
• The role of urinary cortisol in cognitive gains requires further investigation.

Purpose of the Study:

• To examine the relationship between cortisol levels and cognitive performance gains.
• To investigate associations with crystallized (Gc) and fluid (Gf) intelligence.
• To explore the link between cortisol and everyday cognitive functioning in older adults.

Main Methods:

• Analysis of data from 73 older adults.
• Cortisol assessment using urine sampling.
• Evaluation of performance gains in Gc and Gf abilities.
• Assessment of everyday cognitive functioning measures.

Main Results:

• A significant negative correlation was found between urinary cortisol and Gf performance gains.
• This finding replicates and extends previous research using serum cortisol.
• Cortisol levels were also significantly related to performance in some everyday cognitive tasks.

Conclusions:

• Urinary cortisol is a valid indicator of cognitive performance changes in older adults.
• Elevated cortisol is associated with reduced gains in fluid intelligence.
• Cortisol influences both specific cognitive abilities and broader everyday functioning.