Traces of Intentionality: Balance, Complexity, and Organization in Artworks by Humans and Apes.

Are people able to tell apart a random configuration of lines and dots from a work of art? Previous studies have shown that untrained viewers can distinguish between abstract art made by professional artists, children, or apes. Pieces made by artists were perceived as more intentionally made and organized than the rest. However, these studies used paintings by prominent abstract artists (e.g., Mark Rothko) as stimuli, which in any case showed that people were able to recognize high-quality paintings made by trained artists, not "any" human. In this study, we presented participants with artworks by untrained human artists versus artworks made by captive chimpanzees in a visual discrimination task. In Study 1, participants viewed sets of human- and non-human-made paintings and were asked to identify the artist as human or ape. In Study 2, they rated the paintings on several criteria: intentionality, organization, balance, and complexity. We found that participants: (1) successfully distinguished between human-made and non-human-made paintings; (2) reported perceiving more balance, organization, and intentionality in human-made paintings; (3) preferred stimuli, which ranked higher in intentionality. We also identified balance, complexity, and organization as key features that influence preference for abstract artworks. Overall, our results show that even non-figurative paintings made by adults untrained in the visual arts are perceived as intentionally made, suggesting people spontaneously produce and perceive cues of intentionality, generating an implicit human signature in visual art.