Vocational Tests for Mental Defectives

on the Terman Revision of the Binet Scale involve almost exclusively language ability, rote memory, appropriateness, clearness and adequacy of detail in imagery, power of conceptual thought and reasoning, those peculiarly human qualities of mind which mark off, from the defective or immature, the normal completely developed intelligence. On the other hand experiments on animal learning have shown what a high degree of practical ability may exist in the entire absence of any conceptual thought and with very inferior powers of manipulation and exploration. Proceeding down the scale from normal individuals of adult intelligence level, we should expect to find among the subnormal group a large number who