'Hyperkinetic behaviour', 'attention deficit disorder' and 'conduct di
sorder' with antisocial aspects or delinquency are concepts frequently
superimposed, They can be traced back to the classic nosological enti
ty, 'instabilite psychomotrice', still used in French psychiatric noso
graphy, In this paper, the different components of the condition are a
nalyzed (emotional, attentional, posturo-motoric and behavioural) both
in normal subjects and in cases of mild encephalopathies, and for dif
ferent age groups, A criticism is advanced towards the undifferentiate
d approach to the problem in the most current literature.