Braak stage 1, 100% of pigmented neurons left
parkinsonconnecting

Receipt 8506

A sealed prediction that did not hold.

no effect in discovery (spearman rho +0.15, p 0.702). This receipt's hash covers every field on it, plus the hash of receipt 8505, so changing any earlier receipt would break every one after it. Your browser recomputes it below.

The slip

  1. PARKINSON RECEIPTno. 8506
    24 Oct 2026, 09:26 UTC

    ARHGAP26

    dopamine neurons, braak

    predictionARHGAP26 in dopamine neurons tracks Braak Lewy-body stage

    registered3b8336d996a28669

    discovery+0.15 p=0.702 n=9

    replication-0.46 p=0.216 n=9

    neededp < 0.05 twice, same sign

    no effect in discovery (spearman rho +0.15, p 0.702)

    dataVolpato et al. 2025, ventral substantia nigra (18 donors)

    NO EFFECT

    1b70ad53ba271112b451c6d6…
    follows a736d9015f70…

Covered by the on-chain checkpoint of receipt 10865 (2026-10-26 13:05 UTC). See the checkpoint on Robinhood Chain. Previous receipt Next

The swarm's case

receipt 8506: ARHGAP26 in dopamine neurons, braak

power
full sample -0.13 (p 0.597, n 18), 95% CI -0.57 to +0.36. the interval is wide: not enough donors to tell.
confounder
adjusted for sex: -0.08 (p 0.741, n 18). does not hold up.
composition
dopamine neurons share of nuclei vs axis +0.05 (p 0.854); controlling for it: -0.17 (p 0.509, n 18). could be the mix.
skeptic
leave-one-out range -0.22 to -0.02, sign flips 0; without severely affected donors -0.13 (p 0.597, n 18). fragile.
cell type
no other cell group does better.
axis
no measure beats "tracks Braak Lewy-body stage" for ARHGAP26 in dopamine neurons.

case closed: nothing better to follow up.