Color can have positive and negatve effects, and is a good reason why we use color in our therapy sessions. Color helps the client grow new pathways in the brain, but be sure to ask your client for feedback that the use of color is comfortable.
In the experiment with the two mice, when scientists examined their brains, they found that the mouse that had to look and push the lever with colors had massive dendrite growth. The mouse that looked at and pushed the lever without the color did not have the same amount of dendrite growth in its brain.