{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:UIT2EHRE4F3M3UVHH4FQHPGTR3","short_pith_number":"pith:UIT2EHRE","canonical_record":{"source":{"id":"2107.12026","kind":"arxiv","version":4},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"q-bio.NC","submitted_at":"2021-07-26T08:30:18Z","cross_cats_sorted":[],"title_canon_sha256":"d6c28691f12768a08dc455e97edcf3aff288abb5c690bc2cc5ba7c7533e68072","abstract_canon_sha256":"9705ae9d6706c8ca5852250fd3a1a5fd2e035242ff1d9e64e6677ef7628009b8"},"schema_version":"1.0"},"canonical_sha256":"a227a21e24e176cdd2a73f0b03bcd38ec397be77516d6bdf448efcce48539b45","source":{"kind":"arxiv","id":"2107.12026","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.12026","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"arxiv_version","alias_value":"2107.12026v4","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.12026","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"pith_short_12","alias_value":"UIT2EHRE4F3M","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"pith_short_16","alias_value":"UIT2EHRE4F3M3UVH","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"pith_short_8","alias_value":"UIT2EHRE","created_at":"2026-07-05T07:01:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:UIT2EHRE4F3M3UVHH4FQHPGTR3","target":"record","payload":{"canonical_record":{"source":{"id":"2107.12026","kind":"arxiv","version":4},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"q-bio.NC","submitted_at":"2021-07-26T08:30:18Z","cross_cats_sorted":[],"title_canon_sha256":"d6c28691f12768a08dc455e97edcf3aff288abb5c690bc2cc5ba7c7533e68072","abstract_canon_sha256":"9705ae9d6706c8ca5852250fd3a1a5fd2e035242ff1d9e64e6677ef7628009b8"},"schema_version":"1.0"},"canonical_sha256":"a227a21e24e176cdd2a73f0b03bcd38ec397be77516d6bdf448efcce48539b45","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:01:55.950745Z","signature_b64":"SQW5Ew30Uqg4xGLFOCgVu5tcF7heNBDNeY3/OL52siLRcTUrPqrDoLmqVHy915XpNBClxzRAh2cb8qQw8Q6qCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a227a21e24e176cdd2a73f0b03bcd38ec397be77516d6bdf448efcce48539b45","last_reissued_at":"2026-07-05T07:01:55.950310Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:01:55.950310Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.12026","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:01:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jfpv5tR4RqqRcZhuREtt60di9BbzsV7+WUMANw15DVxOP+6gEvSnOhV/TNgfhL4XR+RFdCPJwSlECTVOTd4hDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T18:18:39.472657Z"},"content_sha256":"2dd11bdabc2dd2d744e8ead1f88b94cc12451f250d459fa1a16a25daca973c25","schema_version":"1.0","event_id":"sha256:2dd11bdabc2dd2d744e8ead1f88b94cc12451f250d459fa1a16a25daca973c25"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:UIT2EHRE4F3M3UVHH4FQHPGTR3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hemodynamic Deconvolution Demystified: Sparsity-Driven Regularization at Work","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"q-bio.NC","authors_text":"C\\'esar Caballero-Gaudes, Dimitri Van De Ville, Eneko Uru\\~nuela, Thomas A.W. Bolton","submitted_at":"2021-07-26T08:30:18Z","abstract_excerpt":"Deconvolution of the hemodynamic response is an important step to access short timescales of brain activity recorded by functional magnetic resonance imaging (fMRI). Albeit conventional deconvolution algorithms have been around for a long time (e.g., Wiener deconvolution), recent state-of-the-art methods based on sparsity-pursuing regularization are attracting increasing interest to investigate brain dynamics and connectivity with fMRI. This technical note revisits the main concepts underlying two main methods, Paradigm Free Mapping and Total Activation, in the most accessible way. Despite the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.12026","kind":"arxiv","version":4},"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/2107.12026/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:01:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FaZfrnM0McBX5rzib5+k/VxK/pN5sf5msqCfk2htpno8AqZiltGBsJ6AzvUrZfk+cQDWSqSA+wvFDzXEM9CIAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T18:18:39.473407Z"},"content_sha256":"9c5a3761318c58c0a61cdd0240ce920bbf32bf6e9bca935ad2821f85534be2c3","schema_version":"1.0","event_id":"sha256:9c5a3761318c58c0a61cdd0240ce920bbf32bf6e9bca935ad2821f85534be2c3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UIT2EHRE4F3M3UVHH4FQHPGTR3/bundle.json","state_url":"https://pith.science/pith/UIT2EHRE4F3M3UVHH4FQHPGTR3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UIT2EHRE4F3M3UVHH4FQHPGTR3/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":"2026-08-23T18:18:39Z","links":{"resolver":"https://pith.science/pith/UIT2EHRE4F3M3UVHH4FQHPGTR3","bundle":"https://pith.science/pith/UIT2EHRE4F3M3UVHH4FQHPGTR3/bundle.json","state":"https://pith.science/pith/UIT2EHRE4F3M3UVHH4FQHPGTR3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UIT2EHRE4F3M3UVHH4FQHPGTR3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:UIT2EHRE4F3M3UVHH4FQHPGTR3","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":"9705ae9d6706c8ca5852250fd3a1a5fd2e035242ff1d9e64e6677ef7628009b8","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"q-bio.NC","submitted_at":"2021-07-26T08:30:18Z","title_canon_sha256":"d6c28691f12768a08dc455e97edcf3aff288abb5c690bc2cc5ba7c7533e68072"},"schema_version":"1.0","source":{"id":"2107.12026","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.12026","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"arxiv_version","alias_value":"2107.12026v4","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.12026","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"pith_short_12","alias_value":"UIT2EHRE4F3M","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"pith_short_16","alias_value":"UIT2EHRE4F3M3UVH","created_at":"2026-07-05T07:01:55Z"},{"alias_kind":"pith_short_8","alias_value":"UIT2EHRE","created_at":"2026-07-05T07:01:55Z"}],"graph_snapshots":[{"event_id":"sha256:9c5a3761318c58c0a61cdd0240ce920bbf32bf6e9bca935ad2821f85534be2c3","target":"graph","created_at":"2026-07-05T07:01:55Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2107.12026/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Deconvolution of the hemodynamic response is an important step to access short timescales of brain activity recorded by functional magnetic resonance imaging (fMRI). Albeit conventional deconvolution algorithms have been around for a long time (e.g., Wiener deconvolution), recent state-of-the-art methods based on sparsity-pursuing regularization are attracting increasing interest to investigate brain dynamics and connectivity with fMRI. This technical note revisits the main concepts underlying two main methods, Paradigm Free Mapping and Total Activation, in the most accessible way. Despite the","authors_text":"C\\'esar Caballero-Gaudes, Dimitri Van De Ville, Eneko Uru\\~nuela, Thomas A.W. Bolton","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"q-bio.NC","submitted_at":"2021-07-26T08:30:18Z","title":"Hemodynamic Deconvolution Demystified: Sparsity-Driven Regularization at Work"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.12026","kind":"arxiv","version":4},"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":"sha256:2dd11bdabc2dd2d744e8ead1f88b94cc12451f250d459fa1a16a25daca973c25","target":"record","created_at":"2026-07-05T07:01:55Z","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":"9705ae9d6706c8ca5852250fd3a1a5fd2e035242ff1d9e64e6677ef7628009b8","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"q-bio.NC","submitted_at":"2021-07-26T08:30:18Z","title_canon_sha256":"d6c28691f12768a08dc455e97edcf3aff288abb5c690bc2cc5ba7c7533e68072"},"schema_version":"1.0","source":{"id":"2107.12026","kind":"arxiv","version":4}},"canonical_sha256":"a227a21e24e176cdd2a73f0b03bcd38ec397be77516d6bdf448efcce48539b45","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a227a21e24e176cdd2a73f0b03bcd38ec397be77516d6bdf448efcce48539b45","first_computed_at":"2026-07-05T07:01:55.950310Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:01:55.950310Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SQW5Ew30Uqg4xGLFOCgVu5tcF7heNBDNeY3/OL52siLRcTUrPqrDoLmqVHy915XpNBClxzRAh2cb8qQw8Q6qCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:01:55.950745Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.12026","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2dd11bdabc2dd2d744e8ead1f88b94cc12451f250d459fa1a16a25daca973c25","sha256:9c5a3761318c58c0a61cdd0240ce920bbf32bf6e9bca935ad2821f85534be2c3"],"state_sha256":"8579899eb29b39e1c9c33d3ca55db591b293a420a2a1d942ea08830e70b4f7bb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WCNMaro8Bf9v8ejv8ujN6Zo3bZNoan5dGCHxbgceG1bW+z5hl3/g+6ay5OHkVx4tGgSzuulHKzSP0F3x8VtUBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T18:18:39.478628Z","bundle_sha256":"6740132b59258305da95d999ae51c1219a530a33c3cac707de0603ac662f7f60"}}