What it is
The authors recorded directly from the orbitofrontal cortex of people implanted with stereotactic electroencephalography electrodes while they played a gamified approach-avoidance task, in which choosing to approach a reward also risks punishment. Before a decision to approach, they found two anatomically distinct signals: activity rose in the medial orbitofrontal cortex and fell in the lateral orbitofrontal cortex. In the moments before decisions, these signals rapidly alternated between discrete pro-approach and pro-avoidance states.
Why it matters
The orbitofrontal cortex is proposed to arbitrate approach-avoidance conflicts, yet little was known about the computations it performs in real time while such a decision is being made. Recording inside the human brain during the choice itself shows the medial and lateral compartments pulling in opposite directions and the region flipping between discrete decision states, which the authors present as a new functional architecture for the human orbitofrontal cortex.
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Filed underNeural and Behavioral Psychology Studies, Memory and Neural Mechanisms, Neurotransmitter Receptor Influence on Behavior