In Two Studies of Subjects Who Had Learned to Juggle

Multiple Choice

In two studies of subjects who had learned to juggle or study for a preliminary medical examination, what was the similar influence of this experiential context on brain and behavior?

A) There was no effect on the brain, only behavior.
B) Improved behavior but no change in brain.
C) Improved behavior and increase in gray matter.
D) Improved behavior and decrease in gray matter.