Task relevance modulates the cortical representation of feature conjunctions in the target template

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Understanding how the brain prepares for visual tasks is crucial for cognitive neuroscience.
• The neural basis of representing task-relevant versus task-irrelevant information during preparation remains largely unknown.

Purpose of the Study:

• To investigate cortical representations of task-relevant and task-irrelevant features during visual task preparation.
• To differentiate neural activity patterns during cue viewing versus target template maintenance.

Main Methods:

• Representational Similarity Analysis (RSA) applied to BOLD signals.
• fMRI data collected during cue and delay periods preceding visual search tasks.
• Analysis focused on differentiating representations of spatial frequency (SF) and orientation.

Main Results:

• Widespread cortical regions (frontal, parietal, occipitotemporal) showed representational differences between task-relevant and irrelevant dimensions during target template maintenance.
• Sensory-specific representational differences were observed in the occipital and frontal poles during the cue period, irrespective of task.
• Task relevance was found to modulate visual information representation across the cortex.

Conclusions:

• Task and sensory information are distinctly represented during visual perception and subsequent mental template maintenance.
• The brain dynamically adjusts visual information processing based on task demands, highlighting the role of task relevance in cortical function.