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Functional subdivisions within anterior cingulate cortex and their relationship to autonomic nervous system function.

Scott C Matthews1, Martin P Paulus, Alan N Simmons

  • 1Department of Psychiatry, University of California San Diego, San Diego, CA 92093, USA. scmatthew@ucsd.edu

Neuroimage
|June 29, 2004
PubMed
Summary

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This study reveals functional subdivisions in the anterior cingulate cortex (ACC). The dorsal ACC is linked to response inhibition, while the ventral ACC shows parasympathetic modulation during cognitive tasks.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychophysiology

Background:

  • The anterior cingulate cortex (ACC) is known for diverse functions and has distinct subdivisions.
  • Understanding these subdivisions is crucial for linking cognitive processes with emotional regulation.

Purpose of the Study:

  • To investigate functional subdivisions within the ACC, specifically the dorsal (dACC) and ventral (vACC) regions.
  • To examine the relationship between cognitive interference, task speed, and autonomic nervous system activity within the ACC.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity in 18 healthy subjects.
  • A counting Stroop task with incongruent (INC) and congruent (CON) stimuli was administered at two speeds (2.0s and 1.5s intervals).

Related Experiment Videos

  • Heart rate variability (HRV) was recorded outside the scanner to assess autonomic function.

    • Main Results:

    • A cluster of activation related to response inhibition was identified in the left dACC when comparing INC and CON stimuli.
    • A significant interaction between task speed and stimulus congruency was observed in the left vACC.
    • Activation in the left vACC correlated significantly with high-frequency HRV, suggesting a parasympathetic modulatory role.

    Conclusions:

    • The findings support the existence of functional subdivisions within the ACC.
    • Specific ACC subregions are linked to cognitive interference (dACC) and parasympathetic modulation (vACC).
    • The ACC plays a critical role in integrating cognitive and emotional processes.