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.
- no blame > sufferer becomes irresponsible of their own actions
- relinquishing responsibility > passes responsibility to another i.e. a doctor.
- reductionist > places abnormality down to only biological factors and does not take into account external factors. simplifies the illness a lot.
- McGuffin et al (1996) conducted research into the risk of depression in twins. found 46% concordance in monozygotic twins ans 20% in dyzygotic. suggests genetic link with depression.