The study of human populations is called

Demography

Explanation:

Demography: is the study of human populations; their size, composition and distribution across space and the process by which populations change.

its been noted for the past decade or so that there is some (approximately 5% to 7%) shrinkage in the brains of people who have schizophrenia, most notably in the gray matter, which is an important part structures in the brain’s amygdala, hippocampus and parahippocampus, which are all involved in memory storage and retrieval memory storage and retrieval.

explanation:

ive read articles

sorry, but you do not have posted the diagram.