The public CNP task programs can keep zero delay records after responses before the planned tone

We inspected the public scanner and training programs for the Consortium for Neuropsychiatric Phenomics (CNP) stop-signal task. Both programs initialize a delay field to zero. An early response can end the loop before the audio-start command, so the field can keep zero. A response close to the planned delay can still start audio in the same loop pass. This result is consistent with ds000030 version 1.0.0: 941 zero records had responses at least 1.253 ms before the planned delay. The 16 early responses with positive records were 0.071 to 1.221 ms before it. We also reproduced a cited AutoSci audit. All 533 selection decisions and 532 shared finite run estimates matched. Replacing selected zeros with planned delays reduced the mean integration estimate of stopping time by 33.30 ms in 241 selected scanner runs. The source inspection cannot establish the acquisition revision, event conversion, or acoustic onset. The package preserves source data, task code, hashes, analysis code, tests, results, and instructions.

stop-signal task · stop-signal reaction time · SSRT · event data · timing fields · task software · sensitivity analysis · OpenNeuro