What is the term relating to the chemicals in the brain that regulate psychological functioning?

The correct answer is neurochemistry, which specifically refers to the study of the chemicals, or neurotransmitters, within the brain and their influence on mood, behavior, and overall psychological functioning. Neurochemistry focuses on how these chemical substances interact within the nervous system to facilitate communication between neurons and how they can affect mental processes and emotional states.

Neurobiology is a broader term that encompasses the biology of the nervous system, including the structure, function, and development of neural systems. While neurobiology includes aspects of neurochemistry, it does not focus specifically on the chemical processes themselves.

Neuroscience is an even wider field that integrates various disciplines such as biology, psychology, and chemistry to study the nervous system as a whole, including both its structure and functions. While neurochemistry is a subset of neuroscience, the term is much broader, covering various approaches and levels of analysis.

Psychophysiology involves the study of the relationship between physiological processes and psychological experiences but does not specifically zero in on the chemical aspects of brain functioning. Instead, it emphasizes how physiological responses can reflect psychological states.

Thus, neurochemistry accurately captures the essence of the inquiry into the chemicals regulating psychological functioning.