Human Facial Perception of Primates Through ERP Measurement

Abstract

Several studies, some using electrophysiological methods, have examined the capacity of humans to perceive primate faces. Through subsequent data, humans are confirmed to be far more adept at recognizing human faces, and less skilled at recognizing non-human primate faces. However, comparative perceptual research utilizing non-human primate species as stimuli is limited. In this study, I utilized EEG technology to compare the amplitude and latency of the P1 and N170 components in adults when exposed to chimp, macaque, and human faces. I determined that chimpanzee faces result in a significantly higher P1 amplitude, as well as a faster N170 latency. Human faces, meanwhile, showed a significantly higher N170 amplitude. Macaque faces demonstrated a faster P1 latency. These findings support non-evolutionary mechanisms for facial processing. In addition, the results from the chimpanzee face trials align with previous literature regarding human perception of threatening faces. Overall, through the measurement of the P1 and N170 components, more insight could be gained in regards to human perception of different primate species.