What field of Psychology is this?

A lot of what you mention makes me believe you would like Cognitive Psychology. Cognitive Psychology falls under Experimental Psychology (along with fields such as Social and Developmental). Cog Psych studies internal mental processes, it looks into how people perceive, remember, think, speak, and solve problems. It has a lot of neural anatomy as well as neuroanatomy. Pretty much all fields will have some content on neurochemistry (it is a HUGE aspect of behavior and psychopathology).

I would really suggest just researching the fields and seeing which one sounds most interesting. Psychology falls under two areas: applied and experimental. Applied psychology is where you actually apply the knowledge to patients (where you need a license) and experimental is focused on research.

APPLIED

Clinical, which can include health, child-clinical, geropsychology, and neuropsychology and forensic psychology. There are some that combines specialities such as forensic neuropscyhology.

Counseling

School

EXPERIMENTAL

Cognitive

Social

Personality

Developmental

Industrial/Organizational Psychology (this can be considered Applied in a way, but no license required)

Engineering/human factors

Sports (same as I/O)

Educational (it is different from school)

Biopsychology, physiological psychology, neuroscience (all pretty much the same)

It's not a specific feild in Psychology it's just a part of Psychology so study Psycgology and you'll take all about the human mind and how people act and even some Neuroscience