The conception of the feebleminded person as a mental child and a physical adult serves a definite and practical purpose, but cannot be taken over as a biologic concept. The psychobiologic differences between mental 6 year old and chronologic 6 year old are so great, even if they have many similarities, that protest after protest follows the attempt to drag the mental age theory into every process having to do with the feebleminded. The understanding of the meaning of feeblemindedness and of its biologic relationship will never come through perfection of one artificially detached line, but may be approached by recognizing degree in many diverse and interdependent qualities. More concretely, the greater the number of qualities we can consider in a person, the closer will our results approach those of practical experience. This must be so, since the individual is indivisible in his behavior. And so when we consider examinations
STEVENSON GS. CARDIOVASCULAR PHYSIOLOGY OF THE MENTAL DEFECTIVE. Arch NeurPsych. 1924;12(5):507–517. doi:10.1001/archneurpsyc.1924.02200050022002
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