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The neural mechanisms underlying internally and externally guided task selection.

Joseph M Orr1, Marie T Banich

  • 1Institute of Cognitive Science, University of Colorado Boulder, USA.

Neuroimage
|September 3, 2013
PubMed
Summary

The lateral frontal pole (LFP) and anterior insula (AI) are crucial for selecting tasks based on internal goals, especially when facing external distractions. Medial prefrontal cortex (MFC) may guide actions without strong top-down biases.

Keywords:
Cognitive flexibilityExecutive functionGoal maintenanceVolitionfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Decision Making

Background:

  • Prior research offers conflicting views on whether medial prefrontal cortex (MFC) or lateral frontal pole (LFP) regions are involved in freely chosen actions versus internal goal control.
  • Understanding the neural basis of voluntary task selection is key to comprehending goal-directed behavior.

Purpose of the Study:

  • To investigate the neural mechanisms underlying voluntary task selection for pursuing overarching goals.
  • To differentiate the roles of MFC and LFP in task selection, particularly when influenced by external stimuli.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) with a modified voluntary task switching (VTS) paradigm.
  • Participants voluntarily selected subgoals (individual tasks) under instructions to maintain overall goal adherence (equal task frequency, random order).
  • Examined brain activation patterns in response to task-related external stimuli that could potentially bias task selection.

Main Results:

  • Found that the LFP and anterior insula (AI) were critical for task selection aligned with overarching internal goals.
  • Observed increased LFP and AI activation when participants encountered external stimuli that could interfere with or bias voluntary task choice.
  • Evidence suggested MFC involvement in voluntary task selection, but LFP and AI showed greater cruciality for goal-directed selection.

Conclusions:

  • The LFP plays a significant role in supporting task selection based on abstract, internal goals.
  • The AI is also crucial for goal-directed task selection, especially under conditions of potential external interference.
  • MFC might be more involved in action selection when top-down goal biases are less pronounced.