The BOLD response during Stroop task-like inhibition paradigms: Effects of task difficulty and task-relevant modality

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• The Stroop task is widely used to study selective attention.
• Previous research implicates the prefrontal cortex and anterior cingulate cortex in Stroop task performance.
• Evidence suggests potential functional specialization within these brain regions.

Purpose of the Study:

• To investigate the impact of task modality (color, number, shape) on prefrontal and cingulate cortex activity during the Stroop task.
• To explore functional specialization within these regions based on task demands.

Main Methods:

• Participants completed color, number, and shape Stroop tasks.
• Blood-oxygen-level-dependent (BOLD) functional magnetic resonance imaging (fMRI) data were acquired using a 3T MRI scanner.
• Behavioral data were analyzed for facilitation and interference effects.

Main Results:

• Behavioral analyses confirmed facilitation and interference effects, with task difficulty influencing performance.
• Modular effects of task modality were observed in the prefrontal cortex, even after accounting for task difficulty.
• No significant effect of task-relevant information was found in the anterior cingulate cortex.

Conclusions:

• Task modality can influence prefrontal cortex activation patterns during Stroop tasks.
• The anterior cingulate cortex may not exhibit modality-specific responses in this context.
• Future research on selective attention mediation should account for task context and difficulty.