Figure 1.

A, Sequence of events in the oddball detection task. A saccade target appeared during fixation. A white square around the fixation point (FP) and a 1500 Hz tone were repeatedly presented at a fixed interval. Among the regular repetitions, one stimulus was omitted (missing oddball condition) or changed its color and tone (red square and 667 Hz; deviant oddball condition). Monkeys were required to make a saccade to the target in response to the omission or deviation. B, Recording sites on coronal sections for monkey I. Horizontal locations are slightly jittered for presentation (red dots). The bracket below each section indicates the stereotaxic location L7–L8. Arrowheads on the photomicrograph indicate marking lesions. The higher-magnification view shows the outline of the dentate nucleus, which is used to indicate the locations of recording sites at P10.