the difference between Behavioral neuroscience, Neuropsychology , and Cognitive neuroscience
Behavioral neuroscience is the study of the nervous system's involvement in behavior. This field usually studies the
"lower-level" brain processes shared by all mammals. Research in this area primarily focuses on non-human animal subjects. For example, it often involves surgically operating on rats. In terms of anatomy, this field is most concerned with the subcortical brain, spinal cord, and peripheral nervous system, as well as other systems in the body which interact with the nervous system such as the immune system. (This is synonymous with physiological psychology.)
Cognitive neuroscience is the study of the brain basis for mental phenomena. This field usually studies "higher-level" brain processes, many of which are uniquely human. You could also say that it focuses on the "systems level" of brain function. Research in this area primarily focuses on human subjects. The main methods are functional neuroimaging, neurophysiological recording, and experimental psychology. In terms of anatomy, this field is most concerned with the cerebral cortex and some subcortical areas. (This is the merging of cognitive and biological psychology.)
Neuropsychology has two branches: experimental and clinical. As someone else noted, this field began as a purely experimental field, but the term "experimental neuropsychology" has dissolved due to the rise of behavioral and cognitive neuroscience. It was basically a precursor to those fields. Clinical neuropsychology is a branch of clinical psychology which focuses on diagnosing and treating people with brain damage that has resulted in behavioral deficits. This is an applied field (while the others are basic sciences), so while it employs many of the same methods as behavioral and cognitive neuroscience, the end is to solve specific problems. The end of behavioral and cognitive neuroscience is to gain more knowledge. That is the basic distinction of basic and applied research.
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