Biological and behavioural explanation of abnormality

Genetics

mwntal illness can be passed through genes. Some people may be genetically at risk of developing a mental disorder.

Biochemistry

Neurotrasmitters are thought to be imbalanced in the nervous system of people suffering from psychological disorders. Excessive amounts of activity have been associated with schizopherehia.

Infection

It has been found that the flu can give rise to mental illness such as schizopherehia- 14% of cases can be linked to the flu virus in the womb during the first trimester.

Brain structure/Damage

Abormal behaviour can occur if the structure of the brain is damaged. For example people with larger ventricles tend to suffer from schizophrenia. Also alzheimer's disease is a type of dementia caused by loss of cells i the nervous system.