, XX ., , . . , 1, 1908 1910.
, , , . 50 60- . , .., .., , . - , . -- ().
, ( 50 %) . . . : (1966) , . . (1967), - , .
, , 1960- . .. .., : , , .
- 15 , . , , , . , , , (IQ 70 90 ). (. 1 I) (F84).
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(educationally disabled, children with learning disabilities), , (maladjusted), , (socially and culturally deprived). . , , , , - () , (minimal brain damage) () (minimal brain dysfunction).
(children with attention deficit hyperactivity disorders syndrom ADHD).
, , .
, ( , , , , ). , , ( , , , - , - ). , , ( , , ), ( , , ). , .
--, , .
1 IL2.3.