Human dorsal anterior cingulate cortex neurons mediate ongoing behavioural adaptation
Open Access
- 24 June 2012
- journal article
- clinical trial
- Published by Springer Science and Business Media LLC in Nature
- Vol. 488 (7410), 218-221
- https://doi.org/10.1038/nature11239
Abstract
Functional imaging, single-cell recording and targeted surgical lesions were used in human patients undergoing cingulotomy to show that the dorsal anterior cingulate cortex provides a continuously updated prediction of expected cognitive demand. The dorsal anterior cingulate cortex (dACC) plays an important part in regulating cognitive control in both humans and non-human primates, but its precise function remains a matter of debate. Various hypotheses have been proposed, including reward-based decision making, monitoring for conflict between competing responses, and predicting task difficulty. This paper combines functional imaging, single-cell recording and targeted surgical lesions in human patients preparing for cingulotomy, and shows that the dACC provides a continuously updated prediction of expected cognitive demand. The authors propose that it helps to optimize future behavioural responses by hastening or delaying responses as appropriate to the upcoming cognitive load. The ability to optimize behavioural performance when confronted with continuously evolving environmental demands is a key element of human cognition. The dorsal anterior cingulate cortex (dACC), which lies on the medial surface of the frontal lobes, is important in regulating cognitive control. Hypotheses about its function include guiding reward-based decision making1, monitoring for conflict between competing responses2 and predicting task difficulty3. Precise mechanisms of dACC function remain unknown, however, because of the limited number of human neurophysiological studies. Here we use functional imaging and human single-neuron recordings to show that the firing of individual dACC neurons encodes current and recent cognitive load. We demonstrate that the modulation of current dACC activity by previous activity produces a behavioural adaptation that accelerates reactions to cues of similar difficulty to previous ones, and retards reactions to cues of different difficulty. Furthermore, this conflict adaptation, or Gratton effect2,4, is abolished after surgically targeted ablation of the dACC. Our results demonstrate that the dACC provides a continuously updated prediction of expected cognitive demand to optimize future behavioural responses. In situations with stable cognitive demands, this signal promotes efficiency by hastening responses, but in situations with changing demands it engenders accuracy by delaying responses.This publication has 31 references indexed in Scilit:
- Neurons in Anterior Cingulate Cortex Multiplex Information about Reward and ActionJournal of Neuroscience, 2010
- Cingulate cortex: Diverging data from humans and monkeysTrends in Neurosciences, 2009
- A flexible software tool for temporally-precise behavioral control in MatlabJournal of Neuroscience Methods, 2008
- Neuronal Correlates of Post-Error Slowing in the Rat Dorsomedial Prefrontal CortexJournal of Neurophysiology, 2008
- Human Anterior Cingulate Cortex Neurons Encode Cognitive and Emotional DemandsJournal of Neuroscience, 2005
- Neuronal Activity in Macaque SEF and ACC During Performance of Tasks Involving ConflictJournal of Neurophysiology, 2005
- Conflict monitoring and anterior cingulate cortex: an updateTrends in Cognitive Sciences, 2004
- Conflict adaptation effects in the absence of executive controlNature Neuroscience, 2003
- Volumetric reduction in caudate nucleus following stereotactic lesions of anterior cingulate cortex in humans: a morphometric magnetic resonance imaging studyJournal of Neurosurgery, 2000
- Anterior Cingulate Cortex, Error Detection, and the Online Monitoring of PerformanceScience, 1998