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Face detection is a foundational social skill for primates. This vital function is thought to be supported by specialized neural mechanisms; however, although several face-selective regions have been identified in both humans and nonhuman primates, there is no consensus about which region(s) are involved in face detection. Here we used naturally occurring errors of face detection (i.e., objects with illusory facial features referred to as examples of "face pareidolia") to identify regions of the macaque brain implicated in face detection. Using whole-brain fMRI to test awake rhesus macaques, we discovered that a subset of face-selective patches in inferior temporal cortex (ITC), on the lower lateral edge of the superior temporal sulcus (STS), and the amygdala respond more to objects with illusory facial features than matched non-face objects. Multivariate analyses of the data revealed differences in the representation of illusory faces across the functionally defined regions of interest. These differences suggest that the cortical and subcortical face-selective regions contribute uniquely to the detection of facial features. We conclude that face detection is supported by a multiplexed system in the primate brain.

The cortical and subcortical correlates of face pareidolia in the macaque brain