title: Evaluating face trustworthiness: a model based approach.
abstract: Judgments of trustworthiness from faces determine basic approach/avoidance responses and approximate the valence evaluation of faces that runs across multiple person judgments. Here, based on trustworthiness judgments and using a computer model for face representation, we built a model for representing face trustworthiness (study 1). Using this model, we generated novel faces with an increased range of trustworthiness and used these faces as stimuli in a functional Magnetic Resonance Imaging study (study 2). Although participants did not engage in explicit evaluation of the faces, the amygdala response changed as a function of face trustworthiness. An area in the right amygdala showed a negative linear response-as the untrustworthiness of faces increased so did the amygdala response. Areas in the left and right putamen, the latter area extended into the anterior insula, showed a similar negative linear response. The response in the left amygdala was quadratic--strongest for faces on both extremes of the trustworthiness dimension. The medial prefrontal cortex and precuneus also showed a quadratic response, but their response was strongest to faces in the middle range of the trustworthiness dimension.
authors.affiliation: Department of Psychology and Center for the Study of Brain, Mind and Behavior, Princeton University, Princeton, NJ 08540, USA. atodorov@princeton.edu.
authors.forename: Alexander
authors.initials: A
authors.lastname: Todorov
authors.forename: Sean G
authors.initials: SG
authors.lastname: Baron
authors.forename: Nikolaas N
authors.initials: NN
authors.lastname: Oosterhof
mesh_terms: D000293:Adolescent; D000328:Adult; D000679:Amygdala / Q000502:physiology; D001921:Brain / Q000502:physiology*; D003198:Computer Simulation; D005149:Facial Expression; D005260:Female; D006801:Humans; D007600:Judgment / Q000502:physiology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008959:Models, Neurological; D010364:Pattern Recognition, Visual / Q000502:physiology; D017397:Prefrontal Cortex / Q000502:physiology; D011699:Putamen / Q000502:physiology; D021641:Recognition, Psychology / Q000502:physiology; D012919:Social Behavior; D012938:Social Perception; D035502:Trust; D055815:Young Adult