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Sensory-Biased and Multiple-Demand Processing in Human Lateral Frontal Cortex.

Abigail L Noyce1, Nishmar Cestero2, Samantha W Michalka3

  • 1Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts 02215.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 20, 2017
PubMed
Summary
This summary is machine-generated.

The human lateral frontal cortex (LFC) shows both sensory specialization and multiple demand (MD) functions. Visual-biased LFC regions exhibit stronger MD responsiveness than auditory-biased regions, reconciling competing theories.

Keywords:
auditionfMRIlateral frontal cortexmultiple demand networkvisionworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The lateral frontal cortex (LFC) is crucial for human cognition, but its functional organization is debated.
  • The multiple demand (MD) hypothesis posits domain-general cognitive support from LFC.
  • Alternative views suggest LFC regions are specialized for specific sensory modalities (vision or audition).

Purpose of the Study:

  • To investigate the coexistence of sensory specialization and multiple demand (MD) functionality in human LFC.
  • To test whether previously identified visual- and auditory-biased LFC regions exhibit MD responsiveness.
  • To reconcile competing hypotheses regarding LFC functional organization.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to examine caudal portions of the LFC in human participants.
  • Participants performed visual and auditory 2-back tasks to identify sensory-biased regions.
  • Multiple demand (MD) responsiveness was assessed using BOLD signal recruitment and multi-task activation indices.

Main Results:

  • The study replicated findings of two bilateral visual-biased regions (superior precentral sulcus [sPCS] and inferior precentral sulcus [iPCS]) and two auditory-biased regions (transverse gyrus intersecting precentral sulcus [tgPCS] and caudal inferior frontal sulcus [cIFS]).
  • Visual-biased regions (sPCS, iPCS) demonstrated stronger MD responsiveness compared to auditory-biased regions (tgPCS, cIFS).
  • Neither visual- nor auditory-biased regions reached the MD responsiveness levels of the dorsal anterior cingulate/presupplemental motor area or anterior insula.

Conclusions:

  • The findings demonstrate that human LFC exhibits both sensory specialization and multiple demand (MD) functionality.
  • Visual-biased LFC regions show significant MD engagement, while auditory-biased regions show weaker MD responses.
  • This study reconciles competing views by showing a coexistence of domain-general and domain-specific functions within the LFC.