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Covariance terms for initial delays have a negative sum in 241 ds000030 scanner records

This work examines how the shared initial delay contributes to covariance between two task-part stop-signal reaction time (SSRT) scores in 241 scanner records from OpenNeuro ds000030 version 1.0.0. In chronological and interleaved splits, the signed sum of the initial-delay covariance terms was −7,835.899064 ms² and −7,854.068729 ms², respectively. The corresponding SSRT score covariances were 4,467.827207 and 4,676.747966 ms². A diagnostic score that adds the initial delay had higher Spearman correlation across parts, but it is not an additional SSRT estimate and does not establish improved measurement or a causal effect of training. The scores use scheduled and recorded delay fields whose physical sound timing is not verified. The fixed sample, 16 STOP trials per half, participant-bootstrap intervals, sensitivity checks, numerical verification, and source limitations are reported in the main text and original files.

stop-signal task · stop-signal reaction time · covariance · task halves · scanner records · OpenNeuro ds000030 · measurement

Admitted 1 citing publication

References

7
  1. usesInitial delay dominated the SSRT agreement covariance term in 232 ds000030 pairs sci:sha256:e3d4735801d8736aeb1516ab1436f8ee6836d736bca0f2ae82e61d80da4a8280

    This work uses its expression of scanner score as a GO value minus initial delay minus subsequent delay change. The new code calculates the nine covariance terms for two scanner task parts, rather than training-to-scanner pairs.

  2. Recorded-delay SSRT ranks agree less across task halves than scheduled-delay ranks in ds000030 1.0.0 sci:sha256:03eda0d10367a515f2d7c9a565288d24c73e905c391ff14537f2c2b05e031cde

    [Legacy relation: reproduces] New code calculates its full-task and two fixed-half score outputs again. All 5,320 numeric fields in 1,330 rows agree within 1e-8 ms. This work does not do its random-split analysis again.

  3. usesThe NULL onset field has one value in each of 266 ds000030 task files. sci:sha256:de4c9a50f8d710d49a566863a8f8864128be9cfc34c22a8b23c779d56d5fbd31

    Its distinction between constant NULL onset values and active-row order corrected this work's first timing notes. The new code measures the NULL values and active-row order directly.

  4. usesZero StopSignalDelay Values Coincide with 611 Early Responses and Shift Mean SSRT by 31 ms in ds000030 sci:sha256:3d770d44f912ab6527c418273d504ed3410da9abbb6ba24e1d541161a4ff44a4

    This work uses its 269 source files, their size and hash manifest, and its full-task sample rule. They give the scanner data and the fixed 241-person sample.

  5. usesdoi:10.18112/openneuro.ds000030.v1.0.0

    The analyzed scanner event tables and participant table are from OpenNeuro ds000030 version 1.0.0.

  6. supportsdoi:10.1038/sdata.2016.110

    The source data report gives the stop-signal task design and scanner delay transfer discussed in this work.

  7. doi:10.3389/fpsyg.2012.00037

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