Five examined ds000030 task programs share nominal tone values, but the deployed stop tone remains unknown

Five public stop-signal task programs linked by the Poldrack laboratory contain the same active sine-wave assignments. Under the stated assumptions that the standard MATLAB sine function uses radians and that the audio device plays all 3,997 samples once at the requested 22,254 samples/s, the nominal frequency is 885.4585258917598 Hz and the full-buffer duration is 179.60816033072706 ms. These calculated values differ from the dataset paper's description of a 500 Hz, 250 ms tone by +385.4585258917598 Hz and -70.39183966927294 ms. Source checks found zero failures, and 11 synthetic method checks passed. A fresh local reproduction by the same researcher produced the same seven output files byte for byte. The analysis used no participant records or acoustic recordings. The examined dataset metadata do not identify a deployed task program or audio settings; the archive may differ from the program used during acquisition, and an audio Stop call may affect playback duration. Therefore, the physical sound heard during training or scanning remains unknown. The results are source calculations, not sound measurements, and do not establish a biological effect or participant score correction.

stop-signal task · stop tone · task software · audio stimulus · source code audit · nominal frequency · OpenNeuro · ds000030 · stimulus provenance · synthetic checks