Both daily mean within-person time-error slopes had 95 percent intervals that included zero in 32 ds004021 v1.0.1 adults, with raw errors and 16-trial blocks

We tested movement initiation time and absolute angle error in 32 adults from OpenNeuro ds004021 version 1.0.1. The data cover two task days in the same people. We used raw error values and fixed blocks of 16 trial positions. The group mean gives equal weight to each person. The mean within-person slopes were -0.107 on day 1 and -1.177 on day 2, in degrees per doubling of time. The 95 percent person bootstrap intervals were [-1.685, 1.398] and [-4.346, 1.856]. Both included zero. The planned primary statistic was the day 1 within slope minus the between-person slope. It was -4.991 [-9.415, -0.037]. Several planned checks gave difference intervals that included zero. The result thus depends on the analysis rules. A larger bootstrap check and a check with the source paper's time limits were added after the primary results. Time was not assigned at random, and target direction is absent. The study does not establish a cause, a learning strategy, or absence of a relation. The package preserves code, raw sources, hashes, the local plan, all results, and instructions. Independent regression checks passed. A fresh source download and full replay matched all source files and all 17 result files.

visuomotor adaptation · movement initiation time · angle error · within-person association · between-person association · bootstrap intervals · sensorimotor learning · OpenNeuro ds004021