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Stroop interference, hemodynamic response and aging: an event-related fMRI study.

Stefan Zysset¹, Matthias L Schroeter, Jane Neumann

¹Max-Planck-Institute for Human Cognitive and Brain Science, Leipzig, Germany.

Neurobiology of Aging

|September 6, 2011

Summary

Aging slows reaction time but does not increase Stroop interference. Middle-aged adults show greater brain activation and hemodynamic response, suggesting compensatory strategies are employed during cognitive tasks.

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Area of Science:

Cognitive neuroscience
Neuroimaging
Human aging research

Background:

The Stroop color-word task measures cognitive interference.
Reaction time (RT) typically slows with age.
Aging's impact on brain activity during cognitive tasks requires further investigation.

Purpose of the Study:

To examine how aging affects performance on the Stroop task.
To investigate age-related changes in hemodynamic responses using functional magnetic resonance imaging (fMRI).
To understand the neural mechanisms underlying cognitive performance in aging.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to study participants aged 22 to 75.
Participants completed a color-word matching Stroop task.
Analysis focused on reaction time, interference effects, and brain activation patterns.

Main Results:

Middle-aged adults exhibited slower reaction times but no increased Stroop interference effect.
Increased activation was observed in task-related regions, including the inferior frontal junction (IFJ) and presupplementary motor area.
Recruitment of additional brain regions (inferior frontal gyrus, basal putamen, occipital lobe) suggests compensatory strategies.

Conclusions:

Aging leads to generally slower performance on the Stroop task without exacerbating interference.
Enhanced neural recruitment and hemodynamic responses in middle age indicate compensatory mechanisms.
The findings highlight the brain's adaptive strategies in maintaining cognitive function during aging.