Figure 1.

The visuoconstruction paradigm consisted of three tasks for each of which the subject responded 'yes' or 'no' after each viewing of a pair of black shapes. Example stimuli are shown for: the motor task (top row), for which the subject responded 'yes' to the same pair of matching shapes shown repeatedly; the matching task (middle row), for which 'yes' means the shapes match without flipping and 'no' means one is flipped, and the square completion task, for which subjects respond 'yes' for shapes that fit together to form a square without flipping and 'no' otherwise.

DiFrancesco et al. Arthritis Research & Therapy 2013 15:R40   doi:10.1186/ar4197
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