Table 1.

Behavioural Data

	♂ = 12		♀ = 12
	M	SD	M	SD
Age	28.0	5.5	26.1	6.0
IQ	114.4	14.3	119.3	14.3
RT (playing against computer partner) (ms)	388.2	101.7	417.7	107.7
RT (playing against human partner) (ms)	405.2	101.7	425.3	91.6
Pay-off computer (playing against computer partner) [points]	360.0	172.4	298.2	107.3
Pay-off subject (playing against computer partner) [points]	803.3	72.4	769.1	104.6
Pay-off computer (playing against human partner) [points]	476.7	133.5	328.2	127.6
Pay-off subject (playing against human partner) [points]	775.0	111.3	808.2	83.4
Questionnaire: Did you have the impression to play against another person? (no, not at all = 1; yes, very much = 7)	5.0	1.7	5.2	1.2