a person may cross the line between normal and abnormal at the point that they cannot deal with the demands of everyday life (they fail to function adequately)
eg = not being able to maintain basic standards of nutrition and hygiene, hold down a job or maintain relationships
Rosenhan and Seligman:
they proposed further signs of failure to cope:
they no longer conform to interpersonal rules (eg maintaining personal space)
they experience severe personal distress
they behave in a way that is irrational or dangerous
example = intellectual disability disorder
having a very low IQ is a statistical infrequency BUT diagnosis would not be made on this basis alone
there would have to be clear signs that the person was not able to cope with the demands of everyday living
so intellectual disability disorder is an example of failure to function adequately
strength = it is a threshold for professional help
in any given year, 25% of us experience symptoms of mental disorder to some degree
most of the time we press on, but when we cease to function adequately, people seek or are referred for professional help
means that the failure to function criterion provides a way to target treatment and services to those who need them most
limitation = definition can lead to discrimination/social control
it is hard to distinguish between failure to function and a conscious decision to deviate from social norms
eg = people may choose to live off-grid as part of an alternative lifestyle choice or take part in high-risk leisure activities
this means that people who make unusual choices can be labelled abnormal and their freedom of choice restricted
extra evaluation = failure to function can be normal
in some cases most of us can't cope (eg bereavement) - it is unfair to give someone a label for reacting normally to difficult circumstances
HOWEVER = failure to function is real regardless of the circumstances - a person may need professional help to adjust to bereavement
means it is hard to know when to base a judgment of abnormality on failure to function