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Related Experiment Video

Updated: Jul 8, 2026

Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis

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Task difficulty in a simultaneous face matching task modulates activity in face fusiform area.

A L W Bokde¹, W Dong, C Born

¹Alzheimer Memorial Center and Geriatric Psychiatry Branch, Department of Psychiatry, Ludwig-Maximilian University, Nussbaumstr. 7, 80336 Munich, Germany. Arun.Bokde@med.uni-muenchen.de

Brain Research. Cognitive Brain Research

|December 6, 2005

Summary

This summary is machine-generated.

Task difficulty modulates brain activity during face matching. The face fusiform area (FFA) shows increased activation, while extrastriate visual areas decrease activation with higher difficulty.

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Area of Science:

Neuroscience
Cognitive Neuroscience
Neuroimaging

Background:

Task difficulty influences neural activation patterns.
Previous research indicated increased frontal lobe activation but unclear effects in extrastriate visual areas.
The role of the face fusiform area (FFA) in response to varying task difficulty remained to be elucidated.

Purpose of the Study:

To investigate how increasing task difficulty affects neural activation, specifically in the face fusiform area (FFA).
To examine the relationship between task difficulty, performance, and brain activation using functional magnetic resonance imaging (fMRI).
To explore the modulation of extrastriate visual areas during face matching tasks of varying difficulty.

Main Methods:

Participants performed a face matching task with image quality degraded at 10%, 20%, 40%, and 60% levels.
Brain activation was measured using functional magnetic resonance imaging (fMRI).
Data were categorized into baseline (0-10% degradation) and difficult (20-60% degradation) levels based on performance.

Main Results:

Task difficulty did not linearly correlate with image degradation levels.
The face fusiform area (FFA) showed increased activation modulated by task difficulty, with performance linearly correlated to FFA activation.
Activation in the dorsolateral prefrontal cortex (DLPFC) increased with difficulty but was not significant when response time was a covariate.
Extrastriate visual areas exhibited decreased activation as task difficulty increased.

Conclusions:

The face fusiform area (FFA) is crucial for face processing and its activation is modulated by task difficulty.
Increased task difficulty enhances FFA response for focused face processing while suppressing less relevant visual extrastriate areas.
Neural mechanisms adapt to task demands, prioritizing specific processing regions like the FFA over general visual areas.