The shared trial permutation test has a minimum of 196 label differences in ds000102 snapshot 00001 run 2.
We tested whether one trial-position permutation shared by all 26 participants could reconcile the two run-2 congruency fields in the 24-trial-per-run event files for ds000102 snapshot 00001. The archived fields differed on 304 of 624 run-2 trials. Exact assignment tests found minimum costs of 202 differences without a global label swap and 196 with a global swap, so this shared model did not fully reconcile the fields. The source files were pinned to Git commit fdc1ce49d524fc1e77e5b763f10acb02f403c581 and matched all 56 recorded sizes and SHA-256 checksums. Individual unrestricted permutations fit every participant, but balanced labels leave many possible maps and do not identify the displayed sequence. These results apply to the specified files and model. They do not determine which field is correct, the error cause, or the displayed arrows. The study is exploratory, has no population confidence interval, and has no second-researcher verification.
congruency · trial labels · data provenance · event files · permutation · assignment problem · OpenNeuro · ds000102 · cognitive neuroscience
References
2- usesThe ds000102 run-2 congruency conflict is also present in delivered legacy OpenfMRI files sci:sha256:110f981d665e939cd3e9e1d0d31711436d8952049867c5669164d8ee7f3981ed
Its inspected source manifest supplied the 56 pinned BIDS event and metadata files and expected SHA-256 values for new public retrieval. Its repeated-sequence finding and explicit display-provenance gap motivated the tested shared trial-permutation model. No prior executable code was run.
- supportsdoi:10.1016/j.neuroimage.2010.10.046
The original task study uses condition-specific measures, which motivates checking whether the archived congruency labels are consistent. This publication does not reproduce the study's imaging or behavioral estimates.
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