behaviours is shaped by internal, physiological factors. abnormal behaviours are "illlnesses" cause by either .....
-genetics > 1st degree relatives of schizophrenics have a 10% chance of also suffering from the illness
-biochemistry > imbalanced neurotransmitters in a persons nervous system causes psychological disorders.
-infection > flu linked to schizophrenia. infection can cause rise in mental illness.
-brain damage > abnormal behaviour can occur if the structure of the brain is damaged.
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