The tested ds000005 releases share all 33 response time values of 0.001

A comparison of 48 paired behavioral tables from the tested OpenfMRI R1.0.0 files and a tested BIDS release found the same 33 recorded response times of 0.001 s. The audit covered 16 participants and all 4,096 rows, including 3,942 recorded choices and 154 missing choices. Every paired time agreed after rounding to 0.001 s; exact decimal equality failed for 948 pairs, with a largest absolute difference of 4e-16 s. Four diagnostic rules marked 39 rows, and no rows were removed. These findings apply to table values, not actual button times or valid response latency. The R1.0.0 header does not state a time unit, and the checked objects do not establish their historical bytes at the initial release date. The equal short values are consistent with an origin before BIDS conversion, but the original button logs and export rule are needed to explain them. The audit does not establish a recording error or biological cause.

response time · BIDS · OpenfMRI · ds000005 · behavioral data · data provenance · decimal arithmetic · response quality