Lec 2 Abnormal Behaviour
• What constitutes abnormal behaviour?
• DSMV has broadened definition of abnormal
• Statistical criteria
• Normal –Average
• Statistical deviation from normal
• Ideally what is set out to do
• Collect data on how population thinks/does
• Deviations from normal are abnormal
• Memory is Behaviour
• Abnormal thoughts, feelings, and actions are all behaviours
• Normal Statistical average for a behaviour
• Restricted to most common behaviours
• Disregards behaviours that are favourable.
• Deviation is standard deviation in statistics
• Abnormal intelligence if IQ ≤ 75
• IQ > 125, abnormal Ex. Of gifted intelligence
• DSM V wants to include statistical normal, “be more statistical”
Fails to do this
Considers certain groups as psychopathological due to statistics despite being
• DSM V and IV if use of substance to alter mind, considered abnormal by
• DSM includes behaviours that are unfavourable but greatly common.
• Disregards Favourable behaviour
• Includes non-favourable behaviours that are common
• What is considered normal in one environment is not normal in another.
o Schizophrenia considered abnormal in all cultures
• Norms situationally defined • Assault is situationally defined by age (ex. Of how a fight between adults is
criminal but between children is play)
• Certain ages expected to develop certain behaviours
• Greater deviation from norm = higher level of concern
• Developmental milestones considered normal
o Fast development is positive and slow is negative
Frequency, intensity, duration