Figure 2.

Electrophysiological responses of the left (top row) and right (bottom row) human nucleus accumbens during reversal learning. A, Grand-averaged ERPs. B, Time-frequency plots show enhanced theta and gamma oscillatory responses to feedback (dB scale, relative to baseline), ∼300–600 ms following visual onset of reinforcement. Losses elicited larger theta power compared with wins; the difference between loss/stay and loss/switch was nonsignificant.