Final answer:
The Capgras Syndrome case history does not involve personality changes. The other statements are true.
Step-by-step explanation:
One of the case histories mentioned, the Capgras Syndrome, is not characterized by personality changes, but rather by the belief that familiar people have been replaced by impostors. This syndrome is often caused by damage to brain regions involved in face recognition and emotional processing. The other statements, A) Phineas Gage experiencing personality changes following a traumatic brain injury, and B) Elliott's case demonstrating the role of emotions in decision-making, are true. However, statement D) that these case histories provide clear and definitive answers to the complexities of brain function and the relationship between the brain and behavior is false.