In the classic study on mental rotation,what did Shepard and Metzler find was the relationship between the speed that participants made judgments on whether two shapes were the same or different,and the degree of rotation?

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Shepard and Metzler found that the time it took participants to decide if two shapes were the same increased linearly with the degree of rotation, indicating that participants mentally rotated the shapes to make their judgments.

In the Classic Study on Mental Rotation,what Did Shepard and Metzler