When Ganel and Goodale had subjects judge whether wooden blocks of varying lengths were "wide"or "narrow,"subject found the task difficult. When asked to grasp the blocks across the middle
A) subjects made errors as a function of the length of the blocks.
B) subjects had difficulty judging where the 'middle' was.
C) subjects' grasping actions were not affected by variations in length of the blocks.
D) the top hat illusion led subjects to misjudge the width of the blocks
E) the Ebbinghaus illusion led subjects to change their grasp when this wasn't needed.

Question

Quizplus · Accepted Answer

Subjects' grasping actions were not affected by variations in the length of the blocks, indicating that the motor system can accurately guide actions based on the actual size of the objects, independent of perceptual judgments which might be influenced by visual illusions or difficulty in verbal judgments.

When Ganel and Goodale Had Subjects Judge Whether Wooden Blocks