Understanding how intrapersonal emotions shape prosocial behavior remains a central question in social and affective science. This research examines the roles of self-experienced emotions and trait empathy across three complementary studies. Study 1 ( N = 503) assessed stable emotionality, trait empathy, and dispositional prosocial tendencies. Study 2 ( N = 80) employed a daily diary design to capture how daily emotional fluctuations and trait empathy related to daily prosocial actions over time. Study 3 ( N = 466) manipulated emotional states through video exposure to examine their effects on donation and volunteering, while testing trait and state empathy mechanisms. Across the three studies, we found that both positive and negative self-emotions were associated with higher prosocial behavior, but mainly among individuals with lower trait empathy, while high-empathy individuals remained consistently prosocial regardless of emotional states. This pattern supports an affect-as-compensation framework, suggesting that self-emotions may serve as motivational signals that compensate for weaker trait empathy. These effects varied in strength depending on contextual factors such as temporal accumulation or prosocial task type. Importantly, we identified distinct mechanisms behind this compensation: among low-empathy individuals, the effects of positive self-emotion were linked to higher other-oriented state empathy, empathic concern and empathic hopefulness, even after accounting for interpersonal emotions. In contrast, the effects of negative self-emotion were not reliably associated with state empathy and were instead related to greater norm-focused reasoning, suggesting a possible non-empathic motivational pathway. Together, this research offers an integrative answer to what kinds of emotions matter, who they affect, and how their effects unfold. It advances theories of emotion-driven prosociality by clarifying boundary conditions and mechanisms, and provides practical implications for cultivating prosociality.
Guo et al. (Thu,) studied this question.