A two-probe task, simulating the location of an electronic component into its socket, was studied using a reciprocal tapping method. Movement time was measured as a function of the lateral and longitudinal target constraints as well as the separation (L) of the two probes. A linear increase in movement time with separation was found. A geometric model that postulated different effects of target height and width in different length zones was supported by multiple regressions within each zone. Results for the single probe version of this task were similar in pattern and magnitude to those of Hoffmann and Sheikh (1994).
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