Age-related changes in cortical blood flow activation during perception and memory

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Aging impacts cognitive functions and brain structure, but the relationship between structural changes and cognitive alterations is not fully understood.
• Some cognitive functions are relatively preserved in older adults, while others show age-related decline.

Purpose of the Study:

• To investigate the neural basis of preserved and reduced cognitive functions in aging.
• To compare regional cerebral blood flow (rCBF) and task performance in young and old adults on visual perceptual and memory tasks.

Main Methods:

• Two experiments were conducted comparing young and old subjects.
• Experiment 1: Assessed visual perception of faces and spatial locations using rCBF.
• Experiment 2: Assessed recognition memory for faces using rCBF.

Main Results:

• In face and location perception, older adults showed preserved accuracy with different rCBF patterns (less prestriate, more frontal/temporal activation).
• Older adults were impaired in face recognition memory, showing reduced activation in encoding areas and increased rCBF in prefrontal cortex during recognition.
• Young adults showed typical activation patterns for both encoding and recognition in memory tasks.

Conclusions:

• The aging brain can alter functional systems to compensate for cognitive changes, maintaining performance in some tasks like perception.
• Failure to compensate, alongside primary processing area dysfunction, may contribute to significant cognitive deficits in aging.