Two distinct cyclic rotations of 41324 identify position timing effects for complete cycles with common additive position and transition terms

We audited whether interval timing separates displayed position terms from directed key transition terms in OpenNeuro ds006502 version 1.0.0. The audit used 143 event tables from 31 adults. It retained 9,049 correct cycle pairs in 2,124 trials. Trained 41324 trials could not separate the effects in any of 87 trained task files. Adding control targets identified all position contrasts in 55 of 56 retest visits under one common position profile. The trained boundary contrast remained unidentified in all 56 visits when each sequence had its own profile. Exact design calculations showed that any two distinct cyclic rotations of 41324 identify all position contrasts for complete cycles with common additive position and transition terms. At a fixed total cycle count, two balanced rotations give twice the boundary contrast variance of all five. This precision result assumes independent interval errors with one variance. Human responses to rotations were not tested. The package contains an exact checker, proof, all 31 rotation subsets, source files, hashes, source row records, and instructions. Fresh retrieval matched 291 files. Independent parsing and numerical ranks passed. A repeat matched all 11 result files.

motor learning · keypress timing · sequence position · key transitions · cyclic rotations · design identification · motor chunking