Abstract
Social comparison theory states that comparison with others should influence an individual's behavior (Festinger, 1954; Munkes & Diehl, 2003). This is primarily due to an upward pressure: the pressure to be better than others, which according to some theories should motivate individuals to increase their level of performance (Munkes & Diehl, 2003; Rijsman, 1974). The effect of upward pressure on individual performance has been tested, but never on effort. To address this gap, we conducted a within-subject design study with N = 40 participants engaged in five-minute video games while presented with scores of a similar, slightly better, or weaker peer, with a control condition omitting the peer's score. Effort-related cardiovascular responses were recorded with initial systolic time interval (ISTI) during the game and baseline conditions. The effect of social comparison on effort was tested with a 4 (social comparison) x 5 (minutes of the tasks) repeated-measures ANOVA on ISTI reactivity. Results showed higher ISTI reactivity, interpreted as increased effort, when participants competed with similar and slightly better peers compared to a weaker peer and the control condition in the last minute of the task, confirming our expectations (Pegna et al., 2019). These results illustrate that social comparison - through its effect on upward pressure - is sufficient to elicit changes in effort-related cardiovascular response.
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