They differ aminly in their focus.
Neurophysioology deals with electrical impulses in the brain and recording
usually from single cells, neuron firing rates and what causes a neuron to
fire are often dependent measures
Neurobiology deals with the biology of the brain really this is a catch all
subject covering just about any aspect of neuroscience
Neuropsychology (what I do) highlights behavior and the neurological mechanisms
behind behavior, it also uses behavior to detect brain damage.
This is just my understanding of the topics but I hope it helps.
Mitch
