Figure 8.

Sites where each type of neuron was recorded. (A) Recording areas. Recording areas are highlighted with a pink ellipse on a lateral view of the monkey brain. We recorded LPFC neurons in both the upper and lower banks of the principal sulcus. Most of the recordings were made in the region between AP30 and AP40. AP, anterior-posterior. (B,C) Recording sites of each type of neuron were mapped onto comparative locations of the right hemisphere of each monkey's brain based on magnetic resonance images. Red crosses, black squares, green triangles, blue circles, and magenta plus signs represent Win/Lose x Black, Black, Green, Blue, and Reward type neurons, respectively. There were no biases in the recorded areas for each type of neuron across four parts separated by the dorsal and ventral parts from the principal sulcus and the anterior and posterior parts from AP 35 (chi-squared test, p > 0.05). The vertical dashed line represents AP 35. AS, arcuate sulcus; PS, principal sulcus.