{"attention":{"assessed_on":null,"assessment_citation_count":null,"citation_as_of":null,"citation_cohort_percentile":null,"citation_count":null,"citation_status":null,"citation_velocity_per_day":null,"cohort_member_count":0,"fwci":null,"history_point_count":0,"history_span_days":0,"momentum_available":false,"momentum_state":null,"next_observation_on":null,"normalized_percentile":null,"observation_cadence_days":null,"open_access":null,"publication_gate_open":false,"readiness":null,"sources":[],"top_10_percent":null,"top_1_percent":null,"velocity_reason":null,"velocity_status":null},"authors":[{"id":"hs-scientist-51b05ddaba783c9b","name":"Gioele Nanni","orcid":null,"orcid_url":null,"slug":"gioele-nanni-51b05dda","url":"/science/scientists/gioele-nanni-51b05dda/"},{"id":"hs-scientist-16b3d8a6add967f5","name":"Christopher Lee","orcid":null,"orcid_url":null,"slug":"christopher-lee-16b3d8a6","url":"/science/scientists/christopher-lee-16b3d8a6/"}],"claims":[{"epistemic_status":"supported","evidence_count":1,"importance":"central","qualification":"Synapse count is a structural proxy; the decomposition is not a numerical fit to the previously reported physiological suppression curve.","statement":"The measured FC2 feedback geometry is dominated by a bearing-uniform FB5A component, with a smaller anti-local hDelta component and negligible direct FC2 recurrence.","type":"descriptive"},{"epistemic_status":"qualified","evidence_count":2,"importance":"central","qualification":"An hDelta-mediated two-goal selector is bounded but not excluded because its biological gain is unmeasured and partial seed dependence appears at higher modeled gains.","statement":"Across the tested connectome-constrained model families, FC2 lacks the local recurrent excitation and full bistability expected of a within-FC2 ring-attractor winner-take-all.","type":"null"},{"epistemic_status":"qualified","evidence_count":1,"importance":"central","qualification":"This is a falsifiable interpretation, not physiological confirmation; FB5A transmitter identity and net inhibitory action on FC2 remain unverified.","statement":"The authors interpret FC2 as normalizing an externally set goal rather than selecting the goal, with FB5A proposed as the leading uniform-normalizer candidate.","type":"mechanistic"},{"epistemic_status":"uncertain","evidence_count":1,"importance":"supporting","qualification":"This prediction has not been tested experimentally and is vulnerable to the absence of a stable two-column readout, saturation and residual hDelta inhibition.","statement":"If FB5A is a global inhibitory normalizer, silencing it during two-goal imaging should preserve the competing-column ratio while increasing overall FC2 activity without reshaping angular tuning.","type":"predictive"},{"epistemic_status":"qualified","evidence_count":1,"importance":"supporting","qualification":"The nomination is structural and the relevant hDeltaC functional driver line is reported as cell-type ambiguous.","statement":"Connectivity nominates an hDeltaC-led recurrent network as the upstream substrate for the goal read by FC2 and excludes the hDeltaK-PFG attractor as its material source.","type":"mechanistic"}],"curation":{"evidence_links":46,"grounded_claims":5,"note":"Selected after full-paper review. The connectome result is strong; the FB5A normalizer mechanism remains a falsifiable interpretation.","source_scope":"authorized_body"},"id":"hs-paper-acac83a754845743","identifiers":{"arxiv":"2607.18969v1","arxiv_url":"https://arxiv.org/abs/2607.18969v1","doi":null,"doi_url":null},"interpretation_cautions":[{"code":"alternative_selector_not_excluded","description":"A gain-dependent hDelta-mediated two-goal selector remains an open biological alternative.","evidence_count":1,"severity":"caution"},{"code":"transmitter_identity_unverified","description":"The normalizer mechanism depends on inhibitory action that has not been physiologically verified for FB5A onto FC2.","evidence_count":1,"severity":"caution"}],"limitations":[{"evidence_count":1,"origin":"authors","statement":"An hDelta-mediated two-goal selector is not excluded because its biological gain is unmeasured and must be settled by physiology."},{"evidence_count":1,"origin":"authors","statement":"The distributed substrate claim is structural, the in-silico model instantiates only FB5A, and the route decomposition is not fitted to the prior suppression-distance curve."},{"evidence_count":1,"origin":"authors","statement":"There are no recordings of the FC2 selection mechanism in this paper; the core contribution is connectome decomposition and computational characterization."},{"evidence_count":1,"origin":"authors","statement":"FB5A's GABAergic label has low classifier confidence and neither the GABAergic nor glutamatergic inhibitory route onto FC2 has been experimentally verified."},{"evidence_count":1,"origin":"authors","statement":"The proposed two-cue experiment may lack a stable two-column ratio, and its readout can be confounded by saturation and remaining hDelta inhibition."}],"media":{"conceptual_illustration":true,"disclosure":"ILUSTRACIÓN CONCEPTUAL · NO ES EVIDENCIA","gallery":[{"height":1350,"media_type":"image/png","position":1,"role":"cover_hero","sha256":"31fb6e91d50497f40e32921a1eb58d0744777bdfe04fca1000c23df67d532bb8","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/editorial/01.png","width":1080},{"height":1350,"media_type":"image/png","position":2,"role":"primary_finding","sha256":"b6020baaddb8dd77cbe7863f3e5657fce230939ed657ac45f575ad6fb54d0dee","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/editorial/02.png","width":1080},{"height":1350,"media_type":"image/png","position":3,"role":"plain_language","sha256":"ffc1e033f0ea140f4a43596525b7f61e4f27beb0aab87e20b897007e3de951f4","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/editorial/03.png","width":1080},{"height":1350,"media_type":"image/png","position":4,"role":"evidence_boundary","sha256":"87581f7cc79eceb8b83823a3977e93163458c2ab8cf3cd42b8db80b718e721c7","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/editorial/04.png","width":1080}],"hero":{"height":1350,"media_type":"image/png","position":1,"role":"cover_hero","sha256":"31fb6e91d50497f40e32921a1eb58d0744777bdfe04fca1000c23df67d532bb8","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/editorial/01.png","width":1080},"illustration_is_evidence":false},"methods":[{"category":"computational_analysis","evidence_count":1,"statement":"Multiple model families are parameterized by connectome-imposed connectivity and evaluated with a seeded-basin test and gain sweeps."},{"category":"comparator_or_control","evidence_count":1,"statement":"Positive and negative ring controls test whether the bistability detector can distinguish local-excitation latching from global-only inhibition."},{"category":"design","evidence_count":1,"statement":"Structural connectome decomposition is paired with computational tests of bistability, feedforward sharpening and two-cue competition."},{"category":"population_or_material","evidence_count":1,"statement":"The principal material is one FlyWire brain containing 85 FC2 neurons, four FB5A neurons and hDelta/vDelta interneurons, with hemibrain used for structural replication."},{"category":"measurement","evidence_count":1,"statement":"Preferred bearing is recovered from FC2/PFL connectivity, while route geometry is measured with synapse-based disynaptic weights binned by bearing distance."},{"category":"replication","evidence_count":1,"statement":"The structural uniformity and anti-local recurrence measurements are repeated in the independently reconstructed hemibrain."},{"category":"statistical_analysis","evidence_count":1,"statement":"The report uses correlations, modulation, route ratios, concentration and thresholded basin-gap comparisons; it does not present a conventional sampling-based inferential framework for the connectome analysis."}],"publication":{"article_type":"preprint","date":"2026-07-21","journal":"arXiv","language":"en","publisher":"","year":2026},"quantitative_findings":[{"comparison":"hDeltaK and PFG routes as candidate sources of the FC2 goal bump","estimate":"less than 0.2% combined; 0.07% and 0.11% separately","estimate_numeric":0.2,"evidence_count":1,"interval_lower":null,"interval_type":null,"interval_upper":null,"measure":"share of total FC2 input","outcome":"Combined hDeltaK and PFG input to FC2","p_value":null,"population":"78,193 FC2 input synapses","unit":"percent upper bound"},{"comparison":"Reference-gain models versus a 114-degree bistable positive control","estimate":"approximately 24 degrees or less, below the authors' 30-degree no-latch bound","estimate_numeric":24,"evidence_count":1,"interval_lower":null,"interval_type":null,"interval_upper":null,"measure":"basin gap","outcome":"Seeded-basin separation at reference gains","p_value":null,"population":"Connectome-parameterized model families","unit":"degrees"},{"comparison":"Bearing-uniform coverage across FC2","estimate":"85 of 85 FC2 neurons; loop modulation 5%","estimate_numeric":85,"evidence_count":1,"interval_lower":null,"interval_type":null,"interval_upper":null,"measure":"covered neurons","outcome":"FB5A coverage of FC2 neurons in FlyWire","p_value":null,"population":"85 FC2 neurons in the FlyWire reconstruction","unit":"neurons"},{"comparison":"Antipodal versus near bearing bins","estimate":"approximately 2.5 (near 37.8, far 94.7)","estimate_numeric":2.5,"evidence_count":1,"interval_lower":null,"interval_type":null,"interval_upper":null,"measure":"far-to-near disynaptic weight ratio","outcome":"Anti-local hDelta recurrence","p_value":null,"population":"FC2-to-hDelta-to-FC2 routes in FlyWire","unit":"ratio"},{"comparison":"Robustness limit versus measured FB5A non-uniformity","estimate":"ratio preserved to alpha about 0.3; measured FB5A non-uniformity 0.04","estimate_numeric":0.3,"evidence_count":1,"interval_lower":null,"interval_type":null,"interval_upper":null,"measure":"modeled non-uniformity alpha","outcome":"Robustness of the two-cue ratio to non-uniform inhibition","p_value":null,"population":"Two-cue competition model","unit":"alpha"}],"reporting":[{"dimension":"claim_evidence_alignment","evidence_count":1,"framework":"general_empirical","rationale":"The paper explicitly distinguishes transmitter-independent structural results from offered mechanistic interpretations and identifies the experiment needed to adjudicate them.","status":"assessable"},{"dimension":"limitations_transparency","evidence_count":1,"framework":"general_empirical","rationale":"The paper reports transmitter uncertainty, alternative mechanisms, threshold choices, model scope, geometry limits, sample fragility and wet-lab confounds.","status":"assessable"},{"dimension":"methods_transparency","evidence_count":1,"framework":"general_empirical","rationale":"Connectome sources, derived bearing axis, model families, controls, thresholds and robustness sweeps are described, with assumptions explicitly separated.","status":"assessable"},{"dimension":"reporting_completeness","evidence_count":1,"framework":"general_empirical","rationale":"Objectives, methods, model controls, results, interpretations and extensive limitations are reported. The score concerns reporting only, not scientific validity.","status":"assessable"},{"dimension":"reproducibility_transparency","evidence_count":1,"framework":"general_empirical","rationale":"The authors report public data, code, committed caches, a test suite, a claims ledger and a versioned archive.","status":"assessable"},{"dimension":"statistical_transparency","evidence_count":1,"framework":"general_empirical","rationale":"The paper reports quantitative thresholds, correlations, ratios and sweeps, but its connectome/model design does not provide a conventional sampling-based uncertainty framework for every structural estimate.","status":"assessable"}],"research_question":"What circuit implements feedback inhibition among FC2 neurons, and does that circuit select one goal through winner-take-all dynamics or normalize a goal selected elsewhere?","schema_version":"hadox.public-science.v5","selection":{"abstract_only":false,"algorithmic_gate":"closed_insufficient_history","algorithmic_selection":false,"approved_on":"2026-07-26","decision":"approved","full_text_read":true,"route":"editorial_fulltext_review"},"slug":"how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6","social":{"caption":"¿Hemos descubierto dónde decide el cerebro de una mosca hacia dónde ir?\n\nUn estudio propone que el circuito que mantiene el rumbo quizá no sea el que elige el objetivo.\n\nHadox presenta una hipótesis falsable: una parte del cerebro podría escoger el objetivo y otra limitarse a mantenerlo estable.\n\nLa ciencia detrás de la idea usa un conectoma —un mapa de conexiones neuronales— para estudiar las neuronas FC2 y FB5A. El resultado sugiere que mantener una decisión y tomarla podrían ser funciones distintas.\n\nLa hipótesis aún debe confirmarse experimentalmente.\n\n🔗 Paper: https://arxiv.org/abs/2607.18969\n\n#HadoxScience #Neurociencia #Ciencia #Drosophila #BrainResearch","cards":[{"height":1350,"media_type":"image/png","position":1,"role":"cover","sha256":"31fb6e91d50497f40e32921a1eb58d0744777bdfe04fca1000c23df67d532bb8","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/social/01.png","width":1080},{"height":1350,"media_type":"image/png","position":2,"role":"finding","sha256":"b6020baaddb8dd77cbe7863f3e5657fce230939ed657ac45f575ad6fb54d0dee","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/social/02.png","width":1080},{"height":1350,"media_type":"image/png","position":3,"role":"plain_language","sha256":"ffc1e033f0ea140f4a43596525b7f61e4f27beb0aab87e20b897007e3de951f4","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/social/03.png","width":1080},{"height":1350,"media_type":"image/png","position":4,"role":"boundary","sha256":"87581f7cc79eceb8b83823a3977e93163458c2ab8cf3cd42b8db80b718e721c7","url":"/science/media/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/social/04.png","width":1080}],"dossier_url":"https://hadox.org/science/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6","language":"es-MX","links_to_dossier":false,"publication_url":"https://www.instagram.com/p/DbGZIRsFrLL/","status":"published","trace_count":11},"study_design":{"family":"computational_modeling","label":"Connectome analysis and computational modeling with cross-connectome replication"},"summary":{"boundaries":["The paper does not experimentally verify FB5A's transmitter or inhibitory action on FC2, does not exclude a gain-dependent hDelta selector, and does not yet confirm the proposed FB5A-silencing signatures in living flies."],"conclusions":["Full-paper analysis supports a robust structural result: FC2 feedback is predominantly global through FB5A, with a smaller anti-local hDelta component and no local recurrent excitation sufficient for a ring-attractor winner-take-all in the tested models. The broader claim that FC2 normalizes a goal selected upstream is a well-specified, falsifiable interpretation rather than a completed physiological demonstration."]},"title":"How the fly holds a single goal: normalization, not selection, in Drosophila FC2","topics":[],"transparency":[{"category":"code_availability","evidence_count":1,"statement":"The authors report a public analysis repository, committed result caches, tests and a versioned Zenodo release.","status":"reported"},{"category":"conflict","evidence_count":0,"statement":"A competing-interests statement was not identified in the extracted full text.","status":"not_reported"},{"category":"data_availability","evidence_count":1,"statement":"The authors report that wiring data come from the public FlyWire and hemibrain connectomes.","status":"reported"},{"category":"funding","evidence_count":0,"statement":"A paper-specific funding statement was not identified in the extracted full text.","status":"not_reported"},{"category":"materials_availability","evidence_count":1,"statement":"The computational materials and load-bearing result caches are reported as versioned and rerunnable.","status":"reported"},{"category":"registration","evidence_count":0,"statement":"No preregistration or registered analysis protocol was identified in the full paper.","status":"not_reported"}],"url":"/science/papers/how-the-fly-holds-a-single-goal-normalization-not-selection-in-drosophila-fc2-ca5aa0e6/"}