Mouse tracking records a computer pointer's trajectory over time as a behavioral measure. In psycholinguistics, its Cartesian coordinates can reveal differences between trials that end in the same choice. The trajectory complements final accuracy and reaction time by preserving part of the movement toward the response.
Michael Spivey, Marc Grosjean and Günther Knoblich tested 42 participants with two object pictures in opposite upper corners of a screen. Participants started at the bottom center; a prerecorded word named the target 0.5 seconds after the pictures appeared. A candy distractor shared initial sounds with the target
candle, while a jacket provided a dissimilar control. Movements showed greater attraction toward the competing object before reaching the correct target.[ref]Continuous attraction toward phonological competitors by Michael Spivey and others. Experiment, Methods and Fig. 1, cohort/control displays and trajectories
The authors used linear interpolation to compare trajectories at 101 normalized time positions. That procedure preserves relative movement progression while changing its time scale. Display geometry and movement instructions remain part of the measurement; a curve alone is not a uniquely identified mental state.
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