We next examined population firing of all DMS neurons (n = 97) in control rats that increased firing on correct trials during the response epoch (i.e., port exit to well entry) (11, 12) (Fig. 2B). Thick and thin lines represent firing when responses were made correctly into and away from the response field of each neuron, respectively. Trials are aligned to the nose-port exit which is a common event between GO and STOP-change trial types (i.e., there is no second cue for GO trials; later plots are aligned to multiple events). On GO trials, population firing rapidly increased in response to the first cue light, prior to exiting the nose port (i.e., time 0 = first light on) for behavioral responses into the response field. The quick development of this signal is consistent with the swift behavioral response observed on GO trials.
