Table 1. Operant conditioning task behavioral data.

	1° Session		3° Session		7° Session
Group	% of Responses	Latency Time	% of Responses	Latency Time	% of Responses	Latency Time
Incompletely Trained (IT)	31.2±2.7	40.3±4.5	61.8±5.9	27.8±3.2	-	-
Trained (Tr)	28.8±2	43±5.3	62.4±4.7	25.7±2.9	100	3.2±0.4

Percentage of responses is expressed as the mean ± sem of correct responses in a 25 trials training session. Latency time is expressed as the mean ± sem of the time that elapses between lever presentation and lever pressing.