Open AccessHuman temporal‐parietal junction spontaneously tracks others' beliefs: A functional near‐infrared spectroscopy study
Author(s) -
Hyde Daniel C.,
Aparicio Betancourt Mariana,
Simon Charline E.
Publication year - 2015
Publication title -
human brain mapping
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.005
H-Index - 191
eISSN - 1097-0193
pISSN - 1065-9471
DOI - 10.1002/hbm.22953
Subject(s) - psychology , theory of mind , cognitive psychology , social cognition , cognition , object (grammar) , clips , social neuroscience , functional near infrared spectroscopy , cognitive neuroscience , brain activity and meditation , neuroscience , prefrontal cortex , computer science , artificial intelligence , electroencephalography
Humans have the unique capacity to actively reflect on the thoughts, beliefs, and knowledge of others, but do we also track mental states spontaneously when observing other people? We asked this question by monitoring brain activity in belief‐sensitive cortex using functional near‐infrared spectroscopy (fNIRS) during free‐viewing of social videos. More specifically, we identified a portion of the right temporal‐parietal junction (rTPJ) selective for mental state processing using an established, explicit theory of mind task, and then analyzed the brain response in that region of interest (ROI) during free‐viewing of video clips involving people producing goal‐directed actions. We found a significant increase in oxygenated hemoglobin concentration in our rTPJ ROI during free‐viewing for all of our test videos. Activity in this region was further modulated by the extent to which the knowledge state, or beliefs, of the protagonist regarding the location of an object contrasted with the reality of where the object was hidden. Open‐ended questioning suggested our participants were not explicitly focusing on belief states of the characters during free‐viewing. Further analyses ruled out lower‐level details of the video clips or general attentional differences between conditions as likely explanations for the results. As such, these results call into question the traditional characterization of theory of mind as a resource intensive, deliberate process, and, instead, support an emerging view of theory of mind as a foundation for, rather than the pinnacle of, human social cognition. Hum Brain Mapp 36:4831–4846, 2015 . © 2015 Wiley Periodicals, Inc .