The balanced ds000102 label model gives a negative lower sample bound when we remove the first two trials per run.
In 26 participants from OpenNeuro ds000102, equal condition weighting gives a positive difference between the late and early run shifts for both stored condition fields: 85.593750 ms for Stimulus and 71.932280 ms for trial_type. The fields disagree on 304 run-2 rows, so neither is treated as the true displayed condition. Under a balanced label model that fixes agreeing labels, permits either label for each conflict, and requires 12 trials per condition per run, the primary sample bound is 19.423291 to 133.570421 ms. Removing the first two trials per run changes that bound to −13.383585 to 110.131548 ms. The lower endpoint's participant-bootstrap interval crosses zero; the sample result does not establish a positive population bound. These exploratory results use one fixed-order task sample and do not identify a causal practice effect or correct condition sequence.
response time · OpenNeuro ds000102 · condition labels · label uncertainty · run shift · sample bounds · participant bootstrap · flanker task · sensitivity analysis
References
3- usesIn ds000102 snapshot 00001, 304 run-2 label conflicts shift the RT contrast by 135 ms sci:sha256:15862d75b2281569c5f5e44449ab3007220eb7bd91aefa8a5653b7dccddb1e2d
The analysis uses its rowwise choice between conflicting fields, fixed agreeing labels, and full-run 12/12 count rule. It applies these rules to the early/late run-shift contrast with at least one retained RT per condition per half, not the prior minimum of eight per whole-run condition.
- The run 2 decrease in mean response time is larger in the first half of the tested ds000102 task. sci:sha256:e8bff3ffeabde655d6e06cfdd03ce69d4764a39599dea27c830bfa839146137b
[Legacy relation: reproduces] A new source parser reproduces 156 participant early/late mean and run-shift values within 1e-9 ms, plus the raw group D and its seeded bootstrap interval. The same half contrast then supports the equal-condition-weight extension.
- doi:10.1016/j.neuroimage.2010.01.002
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