Table 2.

Percent error in learning visual discrimination problems for auditory secondary reinforcement

	Preoperative learning trials				Postoperative learning trials
	1	2	3	4	1	2	3	4
A1	49.0	10.5	6.5	2.5	39.5	5.5	2.0	1.0
A2	46.5	15.5	11.5	8.5	39.0	24.0	15.0	10.5
A3	43.0	30.5	17.0	10.0	54.5	28.0	24.0	12.0
A42-a	47.2	37.5	26.2	19.2	46.0	40.5	32.5	25.5
Mean	46.4	23.5	15.3	10.1	44.8	24.5	18.4	12.3

Numerals indicate the mean percent error obtained on trials 1–4 for problems learned in the last 5 of 20 sessions administered before surgery (preoperative learning) and the last 5 of 20 sessions administered after surgery (postoperative learning). A1–A4 are monkeys with excitotoxic amygdala lesions.

^F2-a Did not reach criterion. Used mean score for last 15 sessions before operation.