Biological reactions to stress are closely associated with emotion, autonomic nervous
system, endocrine system, immune system, conciousness level, memory, coping and motor
system etc. For these stress-responses, the brain has an important role. It is composed of
numerous neurons, and information is chemically transmitted between neurons by
neurotransmitters.
Physiologically these responses are the stimulation-response in the nervous system that
enable the central nervous system process much incoming information correctly in order to
show appropriat response to stimulation.
Because of the complexity of the brain, basic research for stress was limited, while clinical
research based on clinical observation was extensively investigated in the past.
However, marked advances have been made recently in the field of neuroscience, especially
knowledge of the neurotransmitter and methodological development of behavioral physiology
and pharmacology.
Therfore, it can be possible for stress to be studied neurophysiologically and biochemically.
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