Abstract:
:The social world buzzes with action. People constantly walk, talk, eat, work, play, snooze, and so on. To interact with others successfully, we need to both understand their current actions and predict their future actions. Here we used functional neuroimaging to test the hypothesis that people do both at the same time: when the brain perceives an action, it simultaneously encodes likely future actions. Specifically, we hypothesized that the brain represents perceived actions using a map that encodes which actions will occur next: the 6-dimensional ACT-FAST action space. Within this space, the closer two actions are, the more likely they are to precede or follow each other. To test this hypothesis, participants watched a video featuring naturalistic sequences of actions while undergoing fMRI scanning. We first use a decoding model to demonstrate that the brain uses ACT-FAST to represent current actions. We then successfully predicted as-yet unseen actions, up to three actions into the future, based on their proximity to the current action's coordinates in ACT-FAST space. This finding suggests that the brain represents actions using a 6d action space that gives people an automatic glimpse of future actions.
journal_name
Soc Cogn Affect Neuroscijournal_title
Social cognitive and affective neuroscienceauthors
Thornton MA,Tamir DIdoi
10.1093/scan/nsaa126subject
Has Abstractpub_date
2020-09-28 00:00:00eissn
1749-5016issn
1749-5024pii
5912491pub_type
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