Nonlinear visuomotor transformations: Locus and modularity


Verwey, Willem B. and Heuer, Herbert (2007) Nonlinear visuomotor transformations: Locus and modularity. The Quarterly Journal of Experimental Psychology, 60 (12). pp. 1629-1659. ISSN 1747-0218

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Abstract:Participants in two experiments moved a mouse-like device to the right to move a cursor on a
computer screen to a target position. The cursor was invisible during motion but reappeared at the
end of each movement. The relationship between the amplitudes of the cursor movement and the
mouse movement was exponential in Experiment 1 and logarithmic in Experiment 2 for two
groups of participants, while it was linear for the control groups in both experiments. The results
of both experiments indicate that participants adjusted well to the external transformation by developing
an internal model that approximated the inverse of the external transformation. We introduce a
method to determine the locus of the internal model. It indicates that the internal model works at a
processing level that either preceded specification of movement amplitude, or had become part of
movement amplitude specification. Limited awareness of the nonlinear mouse–cursor relationship
and the fact that a working-memory task had little effect on performance suggest that the internal
model is modular and not dependent on high-level cognitive processes
Item Type:Article
Copyright:The Experimental Psychology Society
Faculty of Behavioural, Management and Social sciences (BMS)
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