Braak stage 1, 100% of pigmented neurons left
parkinsonconnecting

Receipt 5001

A sealed prediction that did not hold.

no effect in discovery (spearman rho +0.19, p 0.630). This receipt's hash covers every field on it, plus the hash of receipt 5000, so changing any earlier receipt would break every one after it. Your browser recomputes it below.

The slip

  1. PARKINSON RECEIPTno. 5001
    21 Oct 2026, 05:49 UTC

    GPR4

    dopamine neurons, braak

    predictionGPR4 in dopamine neurons tracks Braak Lewy-body stage

    registerede73158dfc842fb3e

    discovery+0.19 p=0.630 n=9

    replication-0.60 p=0.090 n=9

    neededp < 0.05 twice, same sign

    no effect in discovery (spearman rho +0.19, p 0.630)

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

    NO EFFECT

    79b0c15b135248a76d22e2b1…
    follows 1f94b92b963c…

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 5001: GPR4 in dopamine neurons, braak

power
full sample -0.36 (p 0.148, n 18), 95% CI -0.71 to +0.13. the interval is wide: not enough donors to tell.
confounder
adjusted for sex: -0.41 (p 0.095, n 18). does not hold up.
composition
dopamine neurons share of nuclei vs axis +0.05 (p 0.854); controlling for it: -0.53 (p 0.025, n 18). not the mix.
skeptic
leave-one-out range -0.51 to -0.27, sign flips 0; without severely affected donors -0.36 (p 0.148, n 18). fragile.
cell type
no other cell group does better.
axis
no measure beats "tracks Braak Lewy-body stage" for GPR4 in dopamine neurons.

case closed: nothing better to follow up.