Table 3.

Preoperative and postoperative retention and new learning

Case	Preop learning									Preop retrieval test; % error			Postop retrieval test; % error			Postop new learning
	Errors to criterion			Sessions to criterion			Time until surgery at criterion			Preop retrieval test; % error			Postop retrieval test; % error			Postop new learning
	Set A	Set B	Set C	Set A	Set B	Set C	Set A	Set B	Set C	Set A	Set B	Set C	Set A	Set B	Set C	Set D; errors to criterion	Set D; sessions to criterion
CON1	343	305	169	14	15	8	49	27	9	28	7	4	21	17	22	291	10
CON2	710	337	275	30	14	13	45	27	9	22	18	4	20	16	11	205	9
CON3	573	351	230	22	16	9	49	26	11	12	14	9	12	8	12	164	6
CON4	987	335	278	42	15	10	54	26	14	15	12	7	24	18	11	204	8
CON5	815	341	265	33	13	11	48	18	8	22	28	15	25	21	13	272	12
Mean	686.5	333.8	243.4	28.2	14.6	10.2	49.0	24.8	10.2	19.8	15.8	7.8	20.4	16	13.8	227.2	9
MD+Fx1	299	170	257	12	8	10	60	39	12	17	18	8	30	24	23	517	23
MD+Fx2	447	211	161	20	9	8	47	26	12	23	19	9	30	14	23	1021	47
MD+Fx3	606	293	224	26	12	10	35	21	8	18	20	11	38	28	25	286	12
Mean	450.7	224.7	214	19.33	9.67	9.33	47.33	28.67	10.67	19.33	19	9.33	32.67	22	23.67	608	27.33
ERh1	155	229	194	7	13	10	47	24	6	25	9	6	27	12	23	179	8
ERh2	487	329	274	22	13	15	46	28	8	15	17	6	24	26	14	253	11
ERh3	515	358	299	24	14	14	61	38	10	23	18	7	33	30	22	210	8
Mean	385.7	305.3	255.7	17.67	13.33	13	51.33	30	8	21	14.67	6.3	28	22.67	19.67	214	9

The data shown are the total number of presentations of each set to reach the preoperative performance criterion of >90% correct across two trials; the elapsed time between reaching criterion for sets A, B, and C and surgery; the number of preoperative and postoperative retention errors made during the one-trial retention tests for each set of 100 object-in-place scene discriminations and postoperative new learning of set D; the total number of errors made; and number of sessions required to reach criterion of 90% across two consecutive trials by each monkey. Preop, Preoperative; Postop, postoperative.