Table 2.

Task evaluation.

Measure	CHR	HC	F	P
Positive faces rating	5.618(1.579)	5.233(1.486)	0.565	0.458
Ambiguous faces rating	5.208(1.526)	4.688(1.434)	0.894	0.353
Task believability	4.790(3.207)	5.526(3.151)	0.510	0.480
% button-box response	85.540(30.195)	87.374(25.171)	0.043	0.838

Values presented are mean (standard deviation). Positive and ambiguous faces rating values are on a scale of 0–9, with higher scores indicating a higher rating of social reward. Task believability was also rated on the same scale of 0–9, with higher scores indicating greater believability in task manipulation (i.e. that the stimuli represented actual people who provided the feedback for the present study). Button-box response represents the total time participants pressed a button in response to each individual stimuli as instructed.