{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:27ARCQVWIB4EQJIK2NZMMYWDKP","short_pith_number":"pith:27ARCQVW","canonical_record":{"source":{"id":"1808.02157","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2018-08-06T23:57:26Z","cross_cats_sorted":[],"title_canon_sha256":"5a7b792dfb337628095e1b6d6c2842f4aadb71e1978691db06321cd22f1da56f","abstract_canon_sha256":"615d051cf883f4e8ec008ca624df5f33de53297f086f7b4dd0c692c9044f7eff"},"schema_version":"1.0"},"canonical_sha256":"d7c11142b6407848250ad372c662c353de9ba9f901b0abb1f56299dd9dab90af","source":{"kind":"arxiv","id":"1808.02157","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.02157","created_at":"2026-05-18T00:08:47Z"},{"alias_kind":"arxiv_version","alias_value":"1808.02157v1","created_at":"2026-05-18T00:08:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.02157","created_at":"2026-05-18T00:08:47Z"},{"alias_kind":"pith_short_12","alias_value":"27ARCQVWIB4E","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"27ARCQVWIB4EQJIK","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"27ARCQVW","created_at":"2026-05-18T12:31:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:27ARCQVWIB4EQJIK2NZMMYWDKP","target":"record","payload":{"canonical_record":{"source":{"id":"1808.02157","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2018-08-06T23:57:26Z","cross_cats_sorted":[],"title_canon_sha256":"5a7b792dfb337628095e1b6d6c2842f4aadb71e1978691db06321cd22f1da56f","abstract_canon_sha256":"615d051cf883f4e8ec008ca624df5f33de53297f086f7b4dd0c692c9044f7eff"},"schema_version":"1.0"},"canonical_sha256":"d7c11142b6407848250ad372c662c353de9ba9f901b0abb1f56299dd9dab90af","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:47.439125Z","signature_b64":"5QdvF2vEWuIScRZLolmaJPoaiYQDywdSKTbKD8sPHH6TYMNqGqa7mBk+nUxN3qCKomMW5BDMFmrdsQkXPFyCBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d7c11142b6407848250ad372c662c353de9ba9f901b0abb1f56299dd9dab90af","last_reissued_at":"2026-05-18T00:08:47.438443Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:47.438443Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.02157","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:08:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bMHhe27pWqMO31HFVmnzlzx24joGNvcdr3Lq4C9Jc0MdvczYLMWf5NEEyXv1HVnvnsoxHYLjDCIv7secGjQeDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T03:58:24.939248Z"},"content_sha256":"bebae2cfa0583402949d417e384e4c8e9bb4cad616a06c9f852a8b37fdc3ed5b","schema_version":"1.0","event_id":"sha256:bebae2cfa0583402949d417e384e4c8e9bb4cad616a06c9f852a8b37fdc3ed5b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:27ARCQVWIB4EQJIK2NZMMYWDKP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experimental Design Modulates Variance in BOLD Activation: The Variance Design General Linear Model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"q-bio.NC","authors_text":"Garren Gaut, Mark Steyvers, Xiangrui Li, Zhong-Lin Lu","submitted_at":"2018-08-06T23:57:26Z","abstract_excerpt":"Typical fMRI studies have focused on either the mean trend in the blood-oxygen-level-dependent (BOLD) time course or functional connectivity (FC). However, other statistics of the neuroimaging data may contain important information. Despite studies showing links between the variance in the BOLD time series (BV) and age and cognitive performance, a formal framework for testing these effects has not yet been developed. We introduce the Variance Design General Linear Model (VDGLM), a novel framework that facilitates the detection of variance effects. We designed the framework for general use in a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.02157","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:08:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jALlmfiJEAOylRALAXsnQ/TFOD6RdeKEFho4c+e2TmdbzZ2C9gjVU7jp9QiaAEXKctChmdgclFXi+09Hmyg4AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T03:58:24.939832Z"},"content_sha256":"3c3a9e5f3763b424136c33accddda17f170618ff3f4f70768d31d122492dbe42","schema_version":"1.0","event_id":"sha256:3c3a9e5f3763b424136c33accddda17f170618ff3f4f70768d31d122492dbe42"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/27ARCQVWIB4EQJIK2NZMMYWDKP/bundle.json","state_url":"https://pith.science/pith/27ARCQVWIB4EQJIK2NZMMYWDKP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/27ARCQVWIB4EQJIK2NZMMYWDKP/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-30T03:58:24Z","links":{"resolver":"https://pith.science/pith/27ARCQVWIB4EQJIK2NZMMYWDKP","bundle":"https://pith.science/pith/27ARCQVWIB4EQJIK2NZMMYWDKP/bundle.json","state":"https://pith.science/pith/27ARCQVWIB4EQJIK2NZMMYWDKP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/27ARCQVWIB4EQJIK2NZMMYWDKP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:27ARCQVWIB4EQJIK2NZMMYWDKP","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"615d051cf883f4e8ec008ca624df5f33de53297f086f7b4dd0c692c9044f7eff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2018-08-06T23:57:26Z","title_canon_sha256":"5a7b792dfb337628095e1b6d6c2842f4aadb71e1978691db06321cd22f1da56f"},"schema_version":"1.0","source":{"id":"1808.02157","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.02157","created_at":"2026-05-18T00:08:47Z"},{"alias_kind":"arxiv_version","alias_value":"1808.02157v1","created_at":"2026-05-18T00:08:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.02157","created_at":"2026-05-18T00:08:47Z"},{"alias_kind":"pith_short_12","alias_value":"27ARCQVWIB4E","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"27ARCQVWIB4EQJIK","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"27ARCQVW","created_at":"2026-05-18T12:31:59Z"}],"graph_snapshots":[{"event_id":"sha256:3c3a9e5f3763b424136c33accddda17f170618ff3f4f70768d31d122492dbe42","target":"graph","created_at":"2026-05-18T00:08:47Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Typical fMRI studies have focused on either the mean trend in the blood-oxygen-level-dependent (BOLD) time course or functional connectivity (FC). However, other statistics of the neuroimaging data may contain important information. Despite studies showing links between the variance in the BOLD time series (BV) and age and cognitive performance, a formal framework for testing these effects has not yet been developed. We introduce the Variance Design General Linear Model (VDGLM), a novel framework that facilitates the detection of variance effects. We designed the framework for general use in a","authors_text":"Garren Gaut, Mark Steyvers, Xiangrui Li, Zhong-Lin Lu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2018-08-06T23:57:26Z","title":"Experimental Design Modulates Variance in BOLD Activation: The Variance Design General Linear Model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.02157","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:bebae2cfa0583402949d417e384e4c8e9bb4cad616a06c9f852a8b37fdc3ed5b","target":"record","created_at":"2026-05-18T00:08:47Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"615d051cf883f4e8ec008ca624df5f33de53297f086f7b4dd0c692c9044f7eff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.NC","submitted_at":"2018-08-06T23:57:26Z","title_canon_sha256":"5a7b792dfb337628095e1b6d6c2842f4aadb71e1978691db06321cd22f1da56f"},"schema_version":"1.0","source":{"id":"1808.02157","kind":"arxiv","version":1}},"canonical_sha256":"d7c11142b6407848250ad372c662c353de9ba9f901b0abb1f56299dd9dab90af","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d7c11142b6407848250ad372c662c353de9ba9f901b0abb1f56299dd9dab90af","first_computed_at":"2026-05-18T00:08:47.438443Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:47.438443Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5QdvF2vEWuIScRZLolmaJPoaiYQDywdSKTbKD8sPHH6TYMNqGqa7mBk+nUxN3qCKomMW5BDMFmrdsQkXPFyCBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:47.439125Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.02157","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bebae2cfa0583402949d417e384e4c8e9bb4cad616a06c9f852a8b37fdc3ed5b","sha256:3c3a9e5f3763b424136c33accddda17f170618ff3f4f70768d31d122492dbe42"],"state_sha256":"94fe96b320e5577acc146366dd72fb371440480fb4e35ca964f6511d6dbaae80"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TOqPfEusJ5dUuh3Lzs+QZN+Ua5qKI+1oDsm5KxwKqXsHNPh8claDaObhaL72uJ0a2C+ok6+jazn+1XcJC/jZCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-30T03:58:24.943485Z","bundle_sha256":"ad44fbcda0a3086985f59dbbcac5a6e26e023b64861d87d04d67eff68727b2e4"}}