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Human dorsal anterior cingulate cortex neurons mediate ongoing behavioural adaptation.

Sameer A Sheth1, Matthew K Mian, Shaun R Patel

  • 1Nayef Al-Rodhan Laboratories, Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.

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The dorsal anterior cingulate cortex (dACC) neuron activity predicts cognitive load, influencing behavior. This brain region optimizes responses to changing environmental demands, enhancing cognitive control.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Human Cognition

Background:

  • Cognitive control is crucial for adapting to changing environments.
  • The dorsal anterior cingulate cortex (dACC) is implicated in cognitive control, but its precise mechanisms are unclear.
  • Previous hypotheses suggest dACC involvement in decision-making, conflict monitoring, and task difficulty prediction.

Purpose of the Study:

  • To investigate the role of individual dACC neurons in encoding cognitive load.
  • To elucidate the neural mechanisms underlying behavioral adaptation to varying cognitive demands.
  • To determine the necessity of the dACC for conflict adaptation (Gratton effect).

Main Methods:

  • Functional neuroimaging (fMRI) in humans.
  • Single-neuron recordings from the dACC in humans.
  • Behavioral experiments measuring reaction times and accuracy.
  • Surgical ablation of the dACC in a subset of participants.

Main Results:

  • Single dACC neuron firing rates correlate with current and recent cognitive load.
  • Past cognitive load influences current dACC activity, leading to behavioral adaptation (Gratton effect).
  • This conflict adaptation is abolished following dACC ablation.

Conclusions:

  • The dACC provides a continuously updated prediction of cognitive demand.
  • This prediction optimizes future behavioral responses for efficiency or accuracy based on demand stability.
  • The dACC is essential for adaptive behavioral adjustments in response to changing cognitive demands.