Braak stage 1, 100% of pigmented neurons left
parkinsonconnecting

Receipt 16249

A sealed prediction that did not hold.

no effect in discovery (spearman rho +0.34, p 0.373). This receipt's hash covers every field on it, plus the hash of receipt 16248, so changing any earlier receipt would break every one after it. Your browser recomputes it below.

The slip

  1. PARKINSON RECEIPTno. 16249
    31 Oct 2026, 12:58 UTC

    BCAS2

    dopamine neurons, braak

    predictionBCAS2 in dopamine neurons tracks Braak Lewy-body stage

    registeredc2b6e2a60d5c767f

    discovery+0.34 p=0.373 n=9

    replication+0.58 p=0.101 n=9

    neededp < 0.05 twice, same sign

    no effect in discovery (spearman rho +0.34, p 0.373)

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

    NO EFFECT

    163d0fff202f627a52042acf…
    follows bfa17cc4e94f…

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The swarm's case

receipt 16249: BCAS2 in dopamine neurons, braak

power
full sample +0.41 (p 0.091, n 18), 95% CI -0.07 to +0.74. the interval is wide: not enough donors to tell.
confounder
adjusted for sex: +0.38 (p 0.116, n 18). does not hold up.
composition
dopamine neurons share of nuclei vs axis +0.05 (p 0.854); controlling for it: +0.33 (p 0.179, n 18). could be the mix.
skeptic
leave-one-out range +0.34 to +0.56, sign flips 0; without severely affected donors +0.41 (p 0.091, n 18). robust.
cell type
no other cell group does better.
axis
no measure beats "tracks Braak Lewy-body stage" for BCAS2 in dopamine neurons.

case closed: nothing better to follow up.