Social information is some of the most ambiguous content we encounter in our daily lives, yet in experimental contexts, percepts of social interactions—i.e., whether an interaction is present and if so, the nature of that interaction—are often dichotomized as correct or incorrect based on experimenter-assigned labels. Here, we investigated the behavioral and neural correlates of subjective (or “conscious”) social perception using data from the Human Connectome Project in which participants ( n = 1049; 486 men, 562 women) viewed animations of geometric shapes during fMRI and indicated whether they perceived a social interaction or random motion. Critically, rather than experimenter-assigned labels, we used observers’ own reports of “Social” or “Non-social” to classify percepts and characterize brain activity, including leveraging a particularly ambiguous animation perceived as “Social” by some but “Non-social” by others to control for visual input. Behaviorally, observers were biased toward perceiving infor...