The biological viewpoint reveals about abnormal behaviour, the biological casual factors of abnormal behaviour are:
The relationship between general paresis and syphilis, the process or traditional biological viewpoint mainly focus on the psychological disorders, the most of the primary symptoms are of cognitive, emotional or behavioural. The mental disorders are considered as the disorders of the central nervous system, autonomic nervous system and endocrine system which are caused by the pathological process. This process is considered to be simple rarely by psychiatrists. The psychologists consider that psychological and sociocultural causal factors play an important role.
Biological causal factors:
The psychological disorders are not caused by damage to the neurological damage. Example the abnormalities which are caused in the neurotransmitter systems in brain can lead to psychological disorders but not damaging the brain. The hallucinations and delusions are not caused simply by damage to the brain.
• Imbalances of neurotransmitters and hormones: the neurons or nerve cells communicate effectively with one another through transmission of nerve impulses that are electrical in nature to help in the function of brain appropriately. Any imbalance in the communication in the neurotransmitter system may lead to the abnormalities.
• Hormonal imbalances: hormones play an important role as chemical messengers which are produced by the endocrine glands. The hormones are secreted into the bloodstream and from there the hormones travel to the target cells influencing the diverse events known as the fight or-flight reactions, sexual responses, and physical growth. Any imbalance in the hormonal changes might lead to biological casual factors for abnormal behaviour.
• Genetic vulnerabilities: the biochemical processes are considered to be affected by the genes in most of the cases. The geneses are the carriers of genetic information which are inherited from the parents and ancestors to the children. There is substantial evidence for genetic influence such as broad temperamental features like example; children with shy and anxious compared to other children are outgoing.
• Temperament: temperament defined as the reactivity and characteristic form of child self-regulation. Babies differ in the temperament in their characteristics in emotions and arousal responses to different stimuli in approaching, withdrawing in various kinds of situations. Example: some children cry by facing sunlight, some are insensitive to the stimulation. Such kinds of reactions are caused due to genetic factors.
• Brain dysfunction and neural plasticity: psychiatric disorders are caused due to particular brain lesions with observable defects in brain tissues in an individual. Any damage to the brain or nervous system might lead to the behavioural disorders in an individual.