This is a excerpt from a longer blog post. MRI tests are allowing us to learn so much about our brains, behavior, emotions, and thought.
Optimism activates both the amygdala (emotions) and the rostral anterior cingulate cortex. an area important for motivation and reward, and error detection. So there may also be direct connections between brain areas important for an optimistic outlook and thinking efficiency.
from Eide Neurolearning Blog