Table 1.

Demographic and behavioral data of subjects in both groups

	Average (SD) nonlearners	Average (SD) learners
Gender (male/total)	5/12	9/17
Age (years)	27.8 (5.2)	26.6 (3.4)
Education (years)	14.8 (1.7)	15.2 (1.9)
Number of choices of HP decks on last 40 trials of task* (learning criterion)	20.4 (3.4)	33.2 (5.5)
Israeli SAT score	678.1 (66.4)	696.4 (56.1)
Completed trials task (of 150)	148.9 (1.2)	148.52 (2.1)
Completed trials control (of 150)	147.8 (3.3)	148 (3.1)
RT task session (ms)	525 (80)	535 (135)
RT control session (ms)	521 (85)	573 (118)

No significant differences were found between the two groups except for task performance (number of choices on the 60 and 75% decks in the last 40 trials of the task (*p < 0.000001). All other independent t test comparisons were not significant (p > 0.2 to p > 0.8). In all of the above shown comparisons, n = 17 for learners and n = 12 for nonlearners, except for SAT scores where n = 15 for learners and 10 for nonlearners.