The effects of aging on the brain activation pattern during a speech perception task: an fMRI study

Area of Science:

• Neuroscience
• Cognitive Psychology
• Aging Research

Background:

• Speech perception relies on complex neural networks.
• Cognitive performance, including accuracy, generally declines with age.
• Understanding age-related changes in brain function is crucial for cognitive health.

Purpose of the Study:

• To investigate age-related alterations in brain activation patterns during speech perception.
• To examine how functional magnetic resonance imaging (fMRI) reveals neural engagement across different adult age groups.
• To identify specific brain regions and lateralization changes associated with aging and speech processing.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
• Four adult participant groups, aged 20-65 years, were categorized by age range.
• Speech perception tasks were administered while participants underwent fMRI scans.

Main Results:

• All age groups activated similar brain regions for speech perception.
• Brain activity initially increased from the youngest to the next age group, then decreased in older groups.
• Significant shifts in brain laterality (left to right) were observed in older participants in specific areas like the superior temporal gyrus, Heschl's gyrus, and cerebellum.

Conclusions:

• While core brain areas for speech perception remain consistent with age, their engagement and recruitment patterns change.
• Neural processing of speech demonstrates age-dependent modifications in activation levels and hemispheric lateralization.
• These findings contribute to the understanding of neural plasticity and cognitive aging.