Answer:True
Explanation:Below are the list of cerebral cortex (part of the brain) function in the body
Determining intelligence.
Determining personality.
Motor function.
Planning and organization.
Touch sensation.
Processing sensory information.
Language processing.
Rats which have been exposed to an environment that stimulates all these functions are likely to have a large part of celebral cortex because these functions have been activated due to their surrounding environment that is well enriched with all sort of things responsible for activating these functions