Definitions of abnormality
The video covers the first 3 definitions. The 4th definition of abnormality (statistical infrequency) can be found on the following website: http://www.simplypsychology.org/abnormal-psychology.html
Characteristics of disorders



The following three videos also demonstrate the characteristics of the three disorders.
The behavioural approach to explaining and treating phobias
​The behavioural approach in Psychology assumes that all behaviour including abnormal behaviour is a result of learnt experiences.  ​To find out more about Behaviourism, click here.
Behavioural explanation: The two-process model, including classical and operant conditioning.
The difference between classical and operant conditioning
The case study of Little Albert - Classical conditioning of a phobia
Behavioural treatments - Flooding and Systematic desensitisation
Click here for more detailed information on systematic desensitization
The cognitive approach to explaining and treating depression
​The cognitive approach assumes all behaviour, including abnormal behaviour can be largely explained through internal mental processes such as thought processes. ​To find out more about the cognitive approach, click here
The biological approach to explaining and treating obsessive compulsive disorder (OCD)
​The biological approach assumes all behaviour, including abnormal behaviour can be largely explained in terms of biology e.g. genes, neurochemistry and the structure and function of the brain. 
​To find out more about the biological approach, click here
Explanations: Genetic and neural explanations

Read this BBC article on how the areas of the brain links to OCD: www.bbc.co.uk/science/humanbody/mind/articles/disorders/causesofocd.shtml
Treatments: Drug therapy - SSRIs
General information on how SSRI's work