Charlotte is 88 years old and is feeling the effects of her long life. She suffered a stroke five years ago, which left the right side of her body limp. She also sometimes has trouble understanding when she is asked questions. Her doctors believe that she also may be suffering from the beginning stages of Alzheimer’s disease. Define each of the following terms and explain how each might contribute to Charlotte’s current circumstance.

• Motor cortex

• Acetylcholine

• Association areas

• Plasticity

• Epigenetics