ABSTRACTIn this research, we investigated whether appraisals of faces follow distinct rules of information integration under arousing versus non-arousing conditions. Support for this prediction was found in four experiments in which participants observed angry faces that were presented with a direct versus an averted gaze, on a red versus a grey background, and after performing a motor exercise versus no exercise. Under arousing conditions, participants’ appraisals of faces reflected summation whereas, under non-arousing conditions, appraisals did not reflect summation and could (...) instead be accounted for by three alternative rules of information integration based on averaging, mere exposure, or the number of strong stimuli. (shrink)