Table 4.

Mean d’ for classifying images with the tumor region removed (“background”)

Experiment and train schedule	Testing image	Pre-test	Post-test 1	Post-test 2	Post-test 3	Final test	Pre-test vs. final test
1A (N = 12) 30-image	Trained	0.12	0.79	0.70	0.83	0.87	P < .002
	Untrained	0.32	0.37	0.35	0.48	0.33	P = .98
1B (N = 12) 60-image	Trained	0.18	0.24	0.26	0.73	0.73	P < .03
	Untrained	0.26	0.36	0.58	0.30	0.16	P = .63
3 (N = 24) 30-image	Trained	−0.10	Not applicable			0.44	P < .001
	Untrained	0.03	Not applicable			0.14	P = .29

P values show results from t tests that compared pre-test with the final post-test. The overall d’ during pre-test was not different from chance, p = .10