Essentials of behaviour genetics / David A. Hay.

  • Hay, David A.
Date:
1985
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Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

Credit: Essentials of behaviour genetics / David A. Hay. Source: Wellcome Collection.

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    ciated with particular IQ levels may be appreciated better by consid¬ ering some of their practical consequences as listed in Table 2.2. Just how much attention should be paid to the exact IQ score is a matter for careful interpretation, since it can be influenced by the sensory and physical handicaps that often accompany more severe retardation. In addition IQ is not everything and social competence must also be considered. Clarke and Clarke (1974) point out that, although 3% of the population have IQs less than 70 and hence the potential to be retarded, less than half of these (at least in the UK) Table 2.2 Levels of retardation and behavioural expectancies at three age levels (modified from President's Panel on Mental Retardation Chart Book, Department of Health, ^Iducation and Welfare, 1963) mental retardation 31