Table 3 Mean correct response time (RT) and accuracy for all the combinations of social condition and difficulty level (alpha value) in Experiments 2a and 2b

 Worse observer

0.809 (0.097)

0.963 (0.115)

1.049 (0.157)

1.124 (0.159)

1.205 (0.184)

1.030 (0.197)

 Better observer

0.753 (0.077)

0.825 (0.081)

0.909 (0.103)

0.978 (0.124)

1.008 (0.159)

0.895 (0.145)

 Collaboration

0.782 (0.075)

0.896 (0.089)

0.978 (0.121)

1.054 (0.135)

1.104 (0.165)

0.963 (0.165)

 average

0.781 (0.085)

0.895 (0.109)

0.979 (0.138)

1.052 (0.149)

1.106 (0.184)

 Worse observer

0.91 (0.06)

0.72 (0.13)

0.61 (0.08)

0.46 (0.13)

0.36 (0.19)

0.61 (0.22)

 Better observer

0.96 (0.02)

0.85 (0.07)

0.77 (0.07)

0.61 (0.07)

0.48 (0.08)

0.73 (0.18)

 Collaboration

0.99 (0.02)

0.95 (0.06)

0.87 (0.12)

0.72 (0.14)

0.57 (0.12)

0.82 (0.18)

 average

0.95 (0.05)

0.84 (0.13)

0.75 (0.14)

0.60 (0.16)

0.47 (0.13)

Experiment 2b

0.69

0.77

0.83

0.87

0.9

average

 Worse observer

0.900 (0.222)

0.935 (0.193)

1.082 (0.297)

1.170 (0.300)

1.275 (0.463)

1.072 (0.329)

 Better observer

0.748 (0.121)

0.836 (0.189)

1.025 (0.259)

1.165 (0.287)

1.271 (0.470)

1.009 (0.341)

 Collaboration

0.823 (0.137)

0.880 (0.147)

1.049 (0.269)

1.170 (0.290)

1.296 (0.451)

1.044 (0.324)

 average

0.824 (0.172)

0.884 (0.176)

1.052 (0.267)

1.168 (0.282)

1.281 (0.445)

 Worse observer

0.89 (0.12)

0.77 (0.16)

0.60 (0.13)

0.48 (0.16)

0.38 (0.18)

0.63 (0.24)

 Better observer

0.99 (0.01)

0.97 (0.03)

0.87 (0.11)

0.61 (0.14)

0.37 (0.18)

0.76 (0.27)

 Collaboration

0.97 (0.03)

0.92 (0.09)

0.84 (0.12)

0.67 (0.17)

0.45 (0.15)

0.77 (0.22)

 average

0.95 (0.08)

0.89 (0.14)

0.77 (0.17)

0.59 (0.17)

0.40 (0.17)