Abstract
Measuring the duration of cognitive processing with reaction time is fundamental to several subfields of psychology. Many methods exist for estimating movement initiation when measuring reaction time, but there is an incomplete understanding of their relative performance. The purpose of the present study was to identify and compare the tradeoffs of 19 estimates of movement initiation across two experiments. We focused our investigation on estimating movement initiation on each trial with filtered kinematic and kinetic data. Nine of the estimates involved absolute thresholds (e.g., acceleration 1000 back to 200 mm/s2, micro push-button switch), and the remaining ten estimates used relative thresholds (e.g., force extrapolation, 5% of maximum velocity). The criteria were the duration of reaction time, immunity to the movement amplitude, responsiveness to visual feedback during movement execution, reliability, and the number of manually corrected trials (efficacy). The three best overall estimates, in descending order, were yank extrapolation, force extrapolation, and acceleration 1000 to 200 mm/s2. The sensitive micro push-button switch, which was the simplest estimate, had a decent overall score, but it was a late estimate of movement initiation. The relative thresholds based on kinematics had the six worst overall scores. An issue with the relative kinematic thresholds was that they were biased by the movement amplitude. In summary, we recommend measuring reaction time on each trial with one of the three best overall estimates of movement initiation. Future research should continue to refine existing estimates while also exploring new ones.
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Data availability
The data and statistical analysis files for the present study are available at https://osf.io/RBYNF/. This experiment was not preregistered.
Code availability
G1.m is available for download from https://people.ok.ubc.ca/brioconn/gtheory/gtheory.html. There are also versions for SAS, SPSS, and R.
Notes
The data and statistical analysis files for the present study are available at https://osf.io/RBYNF/.
G1.m is available for download from https://people.ok.ubc.ca/brioconn/gtheory/gtheory.html. There are also versions for SAS, SPSS, and R.
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Our thanks to two anonymous reviewers for their insightful critiques.
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Appendix
Appendix
Examples of the effective estimates of movement initiation
The figures below illustrate several estimates of movement initiation for one representative trial (participant 36, vision, block 1, trial 28). Each graph has three black vertical lines, which represent, in order, the go signal, movement initiation estimated by the switch, and movement termination.
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Blinch, J., Trovinger, C., DeWinne, C.R. et al. Tradeoffs of estimating reaction time with absolute and relative thresholds. Behav Res (2023). https://doi.org/10.3758/s13428-023-02211-4
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DOI: https://doi.org/10.3758/s13428-023-02211-4