ABSTRACT
Theoretical and methodological difficulties similar to those dealt with previously are also encountered when attempts are made to relate clinical assessments of personality to a unitary concept of “brain damage”. Considerations of the nature, in relation to intellectual functions, have tended to provide the model for subsequent attempts to demonstrate the interrelationship of all forms of inter-individual behavioural variation, the effects of brain damage, and hypothesized neurological processes, thus extending the generalizations to areas of personality and its biological basis. A number of attempts have been made to relate individual differences in behaviour to neural processes theoretically, and in each of these the basic assumption has been that inter-individual behavioural variation is dependent to some extent upon the state or nature of the nervous system which each individual possesses. On the basis of such states of neural inhibition following brain injury, it might also be expected that conditionability would be impaired in subjects suffering from such conditions.
