Aging and prefrontal functions: dissociating orbitofrontal and dorsolateral abilities.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Aging is associated with cognitive changes, particularly in prefrontal cortex (PFC) functions.
• The orbitofrontal cortex (OFC) and dorsolateral prefrontal cortex (DLPFC) are key PFC regions involved in distinct cognitive processes.
• Understanding age-related differences in OFC and DLPFC performance is crucial for characterizing cognitive aging.

Purpose of the Study:

• To investigate whether age differentially affects cognitive performance associated with the OFC versus the DLPFC.
• To compare the sensitivity of OFC and DLPFC tasks to age-related cognitive decline.

Main Methods:

• Healthy younger and older adults completed a battery of cognitive tasks targeting OFC and DLPFC functions.
• Composite z-scores were calculated for OFC and DLPFC task performance.
• A 2x2 ANOVA was used to analyze group (younger vs. older) and task type (OFC vs. DLPFC) effects.

Main Results:

• A significant Group x Task interaction indicated that age effects varied by task type.
• Older adults performed significantly worse than younger adults on OFC tasks, but not on DLPFC tasks.
• OFC tasks demonstrated larger effect sizes for age differences compared to DLPFC tasks.

Conclusions:

• Cognitive functions associated with the OFC are more sensitive to age-related decline than those associated with the DLPFC.
• Differential aging of PFC subregions or compensatory recruitment of alternative brain areas may explain these findings.
• These results highlight the importance of considering specific PFC networks when studying cognitive aging.