{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/88304"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/88304","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Neural signatures of ethnic in-group bias in observing dynamic social interactions","abstract":"Despite evidence for the role of nonverbal communication in the evaluation of social interactions, little is known about the mechanisms through which nonverbal behaviors of individuals of different ethnic groups influence such evaluations. Here, Caucasian participants underwent fMRI recording while observing social interactions with ethnically in-group and out-group members displaying approach and avoidance behaviors. Each behavior was preceded or not by a handshake, and was followed by participants’ ratings of the behavior. Brain imaging assessments identified evidence for ethnic in-group biases in evaluating specific nonverbal behaviors, in the absence of differences in the explicit behavioral ratings. First, the amygdala and dorso-medial prefrontal cortex showed sensitivity to in-group approach behaviors relative to control, and positive associations with the ratings for in-group approach behaviors. Second, enhanced functional connectivity between the amygdala and dorso-medial prefrontal cortex further clarified the mechanisms involved in the processing of in-group approach behaviors. Third, the posterior superior temporal sulcus and nucleus accumbens showed sensitivity to in-group handshakes, which was also linked to the positive impact of handshakes on in-group evaluations. Overall, these findings shed light on the mechanisms underlying intergroup social evaluations, and provide evidence for the neural signatures of ethnic in-group biases to approach and expected greeting behaviors.","abstract_html":"Despite evidence for the role of nonverbal communication in the evaluation of social interactions, little is known about the mechanisms through which nonverbal behaviors of individuals of different ethnic groups influence such evaluations. Here, Caucasian participants underwent fMRI recording while observing social interactions with ethnically in-group and out-group members displaying approach and avoidance behaviors. Each behavior was preceded or not by a handshake, and was followed by participants’ ratings of the behavior. Brain imaging assessments identified evidence for ethnic in-group biases in evaluating specific nonverbal behaviors, in the absence of differences in the explicit behavioral ratings. First, the amygdala and dorso-medial prefrontal cortex showed sensitivity to in-group approach behaviors relative to control, and positive associations with the ratings for in-group approach behaviors. Second, enhanced functional connectivity between the amygdala and dorso-medial prefrontal cortex further clarified the mechanisms involved in the processing of in-group approach behaviors. Third, the posterior superior temporal sulcus and nucleus accumbens showed sensitivity to in-group handshakes, which was also linked to the positive impact of handshakes on in-group evaluations. Overall, these findings shed light on the mechanisms underlying intergroup social evaluations, and provide evidence for the neural signatures of ethnic in-group biases to approach and expected greeting behaviors.","abstract_has_math":false,"creators":["Katsumi, Yuta"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.A.","degree_level":"Thesis","degree_discipline":"Psychology","degree_department":null,"school":null,"contributors":["Dolcos, Florin","Federmeier, Kara"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-29T21:08:17Z","date_published":"2015-09-29T21:08:17Z","updated_at":"2026-07-22T22:26:31Z","subjects":["first impression","nonverbal behavior","ethnicity","in-group bias","functional magnetic resonance imaging (fMRI)"],"languages":["en"],"rights":["Copyright 2015 Yuta Katsumi"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/88304","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dolcos, Florin","Federmeier, Kara"]},{"key":"dc:creator","label":"Author","values":["Katsumi, Yuta"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-29T21:08:17Z","2017-09-30T09:15:30Z","2015-08","2015-07-21","2015-8"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Psychology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.A."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["first impression","nonverbal behavior","ethnicity","in-group bias","functional magnetic resonance imaging (fMRI)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Yuta Katsumi"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/88304"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Despite evidence for the role of nonverbal communication in the evaluation of social interactions, little is known about the mechanisms through which nonverbal behaviors of individuals of different ethnic groups influence such evaluations. Here, Caucasian participants underwent fMRI recording while observing social interactions with ethnically in-group and out-group members displaying approach and avoidance behaviors. Each behavior was preceded or not by a handshake, and was followed by participants’ ratings of the behavior. Brain imaging assessments identified evidence for ethnic in-group biases in evaluating specific nonverbal behaviors, in the absence of differences in the explicit behavioral ratings. First, the amygdala and dorso-medial prefrontal cortex showed sensitivity to in-group approach behaviors relative to control, and positive associations with the ratings for in-group approach behaviors. Second, enhanced functional connectivity between the amygdala and dorso-medial prefrontal cortex further clarified the mechanisms involved in the processing of in-group approach behaviors. Third, the posterior superior temporal sulcus and nucleus accumbens showed sensitivity to in-group handshakes, which was also linked to the positive impact of handshakes on in-group evaluations. Overall, these findings shed light on the mechanisms underlying intergroup social evaluations, and provide evidence for the neural signatures of ethnic in-group biases to approach and expected greeting behaviors.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-08-01","The student, Yuta Katsumi, accepted the attached license on 2015-07-20 at 15:26.","The student, Yuta Katsumi, submitted this Thesis for approval on 2015-07-20 at 21:02.","This Thesis was approved for publication on 2015-07-21 at 08:54.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8570 on 2015-09-29 at 15:06:37","Made available in DSpace on 2015-09-29T21:08:17Z (GMT). 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Here, Caucasian participants underwent fMRI recording while observing social interactions with ethnically in-group and out-group members displaying approach and avoidance behaviors. Each behavior was preceded or not by a handshake, and was followed by participants’ ratings of the behavior. Brain imaging assessments identified evidence for ethnic in-group biases in evaluating specific nonverbal behaviors, in the absence of differences in the explicit behavioral ratings. First, the amygdala and dorso-medial prefrontal cortex showed sensitivity to in-group approach behaviors relative to control, and positive associations with the ratings for in-group approach behaviors. Second, enhanced functional connectivity between the amygdala and dorso-medial prefrontal cortex further clarified the mechanisms involved in the processing of in-group approach behaviors. Third, the posterior superior temporal sulcus and nucleus accumbens showed sensitivity to in-group handshakes, which was also linked to the positive impact of handshakes on in-group evaluations. Overall, these findings shed light on the mechanisms underlying intergroup social evaluations, and provide evidence for the neural signatures of ethnic in-group biases to approach and expected greeting behaviors.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-08-01","The student, Yuta Katsumi, accepted the attached license on 2015-07-20 at 15:26.","The student, Yuta Katsumi, submitted this Thesis for approval on 2015-07-20 at 21:02.","This Thesis was approved for publication on 2015-07-21 at 08:54.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8570 on 2015-09-29 at 15:06:37","Made available in DSpace on 2015-09-29T21:08:17Z (GMT). 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