Paper on group performance which can be compromised by sleep-deprived or cognitively enhanced team membes

Another group member's impairment (sleep deprivation) and enhancement (taking enhancement drugs) lowered participants’ intentions to contribute to the team's performance. These effects were mediated by lowered perceived competence (enhancement and impairment) and warmth (only enhancement) of the other group member. The reason for being impaired or enhanced (altruistic vs. egoistic reason) moderated the indirect effect of the impairment on intended effort via warmth. The results of these two experiments illustrate that people's work motivation is influenced by the psychophysiological states of other group members. Hence, the enhancement of one group member can have the paradoxical effect of impairing the performance of another. This study was published in the European Journal of Social Psychology. [LINK]