In an fMRI, one region of a man's brain appeared activated during a particular test of verbal skills. Ten years later, the man had experienced some minor brain pathology but participated in training exercises to promote his cognitive function. In a recent fMRI, a different region of the brain appeared to be activated while he performed the original verbal skills test. The recent fMRI demonstrates which of the following concepts?

a. lateralization
b. positivity
c. plasticity
d. executive function

Ans: c. plasticity