{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:NCNRSYQ3ERICRSB5O3PJ4FRZ5T","short_pith_number":"pith:NCNRSYQ3","schema_version":"1.0","canonical_sha256":"689b19621b245028c83d76de9e1639ecea5c12026727a8d4f5852ca9b711a743","source":{"kind":"arxiv","id":"1908.08203","version":1},"attestation_state":"computed","paper":{"title":"Outgroup Homogeneity Bias Causes Ingroup Favoritism","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["q-bio.PE"],"primary_cat":"econ.TH","authors_text":"Marcel Montrey, Thomas R. Shultz","submitted_at":"2019-08-22T05:13:26Z","abstract_excerpt":"Ingroup favoritism, the tendency to favor ingroup over outgroup, is often explained as a product of intergroup conflict, or correlations between group tags and behavior. Such accounts assume that group membership is meaningful, whereas human data show that ingroup favoritism occurs even when it confers no advantage and groups are transparently arbitrary. Another possibility is that ingroup favoritism arises due to perceptual biases like outgroup homogeneity, the tendency for humans to have greater difficulty distinguishing outgroup members than ingroup ones. We present a prisoner's dilemma mod"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1908.08203","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"econ.TH","submitted_at":"2019-08-22T05:13:26Z","cross_cats_sorted":["q-bio.PE"],"title_canon_sha256":"86436f00420c35f928daae0a3b7af8c6d2172f092e2091ac32e6d20deef83d46","abstract_canon_sha256":"5fa7d52e1eb5a69c25f4ab325e127f2c21587a270b4a8a22fc9adb3721ba964c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:59:10.490986Z","signature_b64":"7Nh6jdpbHDdQGXsH9RSxCPuZQ2noAcgNcQ0ONCIOz/kHhEXaX7hNuNtKNcYQs+64o1LoUn3O54MQl195YJ8AAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"689b19621b245028c83d76de9e1639ecea5c12026727a8d4f5852ca9b711a743","last_reissued_at":"2026-07-04T23:59:10.490626Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:59:10.490626Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Outgroup Homogeneity Bias Causes Ingroup Favoritism","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["q-bio.PE"],"primary_cat":"econ.TH","authors_text":"Marcel Montrey, Thomas R. Shultz","submitted_at":"2019-08-22T05:13:26Z","abstract_excerpt":"Ingroup favoritism, the tendency to favor ingroup over outgroup, is often explained as a product of intergroup conflict, or correlations between group tags and behavior. Such accounts assume that group membership is meaningful, whereas human data show that ingroup favoritism occurs even when it confers no advantage and groups are transparently arbitrary. Another possibility is that ingroup favoritism arises due to perceptual biases like outgroup homogeneity, the tendency for humans to have greater difficulty distinguishing outgroup members than ingroup ones. We present a prisoner's dilemma mod"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08203","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.08203/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1908.08203","created_at":"2026-07-04T23:59:10.490689+00:00"},{"alias_kind":"arxiv_version","alias_value":"1908.08203v1","created_at":"2026-07-04T23:59:10.490689+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08203","created_at":"2026-07-04T23:59:10.490689+00:00"},{"alias_kind":"pith_short_12","alias_value":"NCNRSYQ3ERIC","created_at":"2026-07-04T23:59:10.490689+00:00"},{"alias_kind":"pith_short_16","alias_value":"NCNRSYQ3ERICRSB5","created_at":"2026-07-04T23:59:10.490689+00:00"},{"alias_kind":"pith_short_8","alias_value":"NCNRSYQ3","created_at":"2026-07-04T23:59:10.490689+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T","json":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T.json","graph_json":"https://pith.science/api/pith-number/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/graph.json","events_json":"https://pith.science/api/pith-number/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/events.json","paper":"https://pith.science/paper/NCNRSYQ3"},"agent_actions":{"view_html":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T","download_json":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T.json","view_paper":"https://pith.science/paper/NCNRSYQ3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1908.08203&json=true","fetch_graph":"https://pith.science/api/pith-number/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/graph.json","fetch_events":"https://pith.science/api/pith-number/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/action/timestamp_anchor","attest_storage":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/action/storage_attestation","attest_author":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/action/author_attestation","sign_citation":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/action/citation_signature","submit_replication":"https://pith.science/pith/NCNRSYQ3ERICRSB5O3PJ4FRZ5T/action/replication_record"}},"created_at":"2026-07-04T23:59:10.490689+00:00","updated_at":"2026-07-04T23:59:10.490689+00:00"}