Domain general frontoparietal regions show modality-dependent coding of auditory and visual rules

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Human Cognition

Background:

• Human cognition exhibits flexible stimulus-response association, crucial for goal-directed behavior.
• The frontoparietal multiple demand (MD) circuit is implicated in domain-general cognitive control.
• The neural representation of rules across different sensory modalities within the MD circuit remains unclear.

Purpose of the Study:

• To investigate whether the MD circuit employs modality-general or modality-tagged neural codes for conceptually identical rules.
• To distinguish between abstract, generalizable representations versus modality-specific codes in cognitive control.

Main Methods:

• Utilized a stimulus-response task with conceptually identical rules presented in both visual and auditory modalities.
• Employed multivariate decoding of functional magnetic resonance imaging (fMRI) data to analyze neural representations.
• Compared neural coding of rules across sensory domains.

Main Results:

• fMRI data revealed overlapping neural resources were recruited for visual and auditory rules.
• However, representations of these rules were expressed in modality-tagged, non-generalizable neural codes.
• This suggests that even conceptually identical rules are not represented in a purely abstract, modality-independent manner.

Conclusions:

• The frontoparietal MD system utilizes shared neural resources for diverse tasks but does not generate modality-general representations of task rules.
• Cognitive control mechanisms rely on modality-specific coding, even when rules are abstract and consistent across sensory inputs.
• Findings challenge the notion of complete domain generality in rule representation within this critical cognitive circuit.