quite distinct from normality, statistical-psychologists notwithstanding. Years of experience with this type of defect has fixed the notion in the writer's mind that feeblemindedness is indicative not only of mental mal-functioning, but also of physiological mal-functioning, especially of endocrine character. The results of further research, however, can be the only tests of the truth of one's statements at this time.
The writer regrets the omission of much pertinent material in this brief presentation, but the later monograph will deal with many topics here barely touched upon, if at all.
Addendum
Regarding the Average Mental Age of Adults
Of importance in interpreting the results of this newly devised mental test is the recently raised question regarding the average mental age of adults. In the promised monograph a few pages will be devoted to a psychological and statistical discussion of this important matter. At this point the writer merely wishes to state that the data so far presented does not warrant accepting the suggestion that "The previous notion that the average intelligence of adults is 16 years should be given up."[1] There is a fundamental fallacy underlying the suggested 13 to 14 year criterion, a complete discussion of which must be left for a later time.
- ↑ E. A. Doll: New Jersey State Prison, Psychologist's Report (1918-1919), p. 72.
