The authors have presented in this paper data which relate to the resistance--screaming, struggling, kicking, etc.--shown by some children to mental tests. In evaluating the significance of this resistant behavior such factors as criteria for classification into groups, reactions to the individual examiner, coaxing, time-intervals, reactions to particular types of test, standardizing of test-situations for different age levels, place, time, and the like, were considered. "The manifestation of resistance by infants and children during mental tests is evidence of some innate behavior pattern. It is typically pronounced at eighteen to twenty-three months in females, and at thirty to thirty-five months in males. It yields gradually with age in both sexes." From Psych Bulletin 21:03:00338. (PsycINFO Database Record (c) 2006 APA, all rights reserved)