In the diagram below, where and how would lithium interact with the pathway? 
Definitions:
Directions of Motion
The path along which something moves, proceeds, or is directed.
Corpus Callosum
Band of white matter containing about 200 million nerve fibers that connects the two cerebral hemispheres to provide a route for direct communication between them.
Prefrontal Association Cortex
A region of the frontal lobes involved in planning complex cognitive behaviors, personality expression, decision making, and moderating social behavior.
Posterior Parietal Cortex
An area of the brain located at the back of the parietal lobe, involved in integrating sensory information and in the coordination of movements.
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