In contrast to the experiments showing how a lack of
use can degrade brain function, several studies in intact
animals have shown how plasticity can be induced within
specific brain regions through extended training.
Monkeys trained to perform fine digit movements by
retrieving small food pellets out of a well had an increase
in digit representation areas within primary
motor cortex.Similarly, rats trained to reach outside of their cage to retrieve
food rewards had an increase in distal forepaw representations
within motor cortex.Synaptogenesis and increased synaptic responseswere found within these same cortical areas. Reorganization of representations within auditory
and somatosensory cortex has