Figure 4.

Recording sites of neurons that showed competitive activity. A, Recording areas. Recording areas are highlighted by a pink ellipse on a lateral view of the monkey brain. We recorded from neurons in both the upper and lower bank of the principal sulcus. Most of the recordings were made from neurons in the region between AP30 and AP40. AP, Anterior–posterior. B, C, Recording sites of neurons that showed competitive activity were mapped onto comparative locations of the right hemisphere of each monkey's brain based on magnetic resonance images (B, monkey H; C, monkey S). The circles, dots, and triangles represent locations in which neurons showed Win-competitive (Win-competitive[+] and Win-competitive[−]), Lose-competitive (Lose-competitive[+] and Lose-competitive[−]), and Win–Lose-competitive activity (Win–Lose-competitive[+] and Win–Lose-competitive[−]), 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 (χ² test; Win-activity, χ² = 2.71, p = 0.44; Lose-activity, χ² = 0.11, p = 0.95; Win-Lose-activity, χ² = 4.3, p = 0.23; the data were pooled from 2 monkeys). The vertical dashed line represents AP 35. AS, Arcuate sulcus; PS, principal sulcus.