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Although matched for IQ in Kindergarten, significant IQ differences appeared in Grade 1 and continued to increase over 5 yr., as those on other tests. Cattell's Early School Personality Questionnaire indicated that low achievers were significantly less mature and more tense and anxious than high achievers from Grades 1 through 5. Maturational lag is hypothesized for retardation of learning.<\/jats:p>","DOI":"10.2466\/pms.1987.64.2.407","type":"journal-article","created":{"date-parts":[[2011,8,31]],"date-time":"2011-08-31T20:46:04Z","timestamp":1314823564000},"page":"407-429","source":"Crossref","is-referenced-by-count":10,"title":["Chronic Learning Problems and Maturation"],"prefix":"10.1177","volume":"64","author":[{"given":"Stephanie Z.","family":"Dudek","sequence":"first","affiliation":[{"name":"Universit\u00e9 de Montr\u00e9al"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Strobel","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Montr\u00e9al"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Antoinette D.","family":"Thomas","sequence":"additional","affiliation":[{"name":"Department of Child Study, Mount Saint Vincent University"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[1987,4,1]]},"reference":[{"key":"bibr1-pms.1987.64.2.407","first-page":"141","volume":"23","author":"Armstrong H.","year":"1955","journal-title":"Journal of Educational Research"},{"key":"bibr2-pms.1987.64.2.407","doi-asserted-by":"publisher","DOI":"10.2466\/pms.1981.52.3.899"},{"key":"bibr3-pms.1987.64.2.407","first-page":"9","volume":"7","author":"Bender L.","year":"1957","journal-title":"Bulletin of the Ortho Society"},{"key":"bibr4-pms.1987.64.2.407","first-page":"81","volume-title":"Reading disability","author":"Benton A. 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