Just like movement, our thoughts should be smooth and coordinated. The cerebellum plays a pivotal role in creating smooth and coordinated movements as well as smooth and coordinated thoughts.

Cerebellar disorders typically manifest with ataxia— incoordination of movement, instability of gait, impairment of articulation, and difficulty with eye movement and swallowing. It has become apparent that many cerebellar patients also experience changes in intellect and mood. Further, mounting evidence suggests that cerebellar pathology may be associated with alterations principally in mental function, rather than motor performance.

This is know as Dysmetria of Thought

"Dysmetria" is defined as "a lack of coordination of movement typified by the undershoot or overshoot of intended position with the hand, arm, leg, or eye (or even thought). It is a type of ataxia.