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Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsRichard E. WylieCatherine Deuoney, Administrative Assistant Preschool, Montgomery County Association for Retarded Citizens, Silver Spring, Maryland; Michael j. Guralnick, Director of Research and Experimental Preschool, National Children's Center, Washington, D.C.; and Helen Rubin, Director of Preschool, Montgomery County Association for Retarded Citizens, Silver Spring, Maryland.Catherine DevoneyCatherine Deuoney, Administrative Assistant Preschool, Montgomery County Association for Retarded Citizens, Silver Spring, Maryland; Michael j. Guralnick, Director of Research and Experimental Preschool, National Children's Center, Washington, D.C.; and Helen Rubin, Director of Preschool, Montgomery County Association for Retarded Citizens, Silver Spring, Maryland.Michael J. GuralnickCatherine Deuoney, Administrative Assistant Preschool, Montgomery County Association for Retarded Citizens, Silver Spring, Maryland; Michael j. Guralnick, Director of Research and Experimental Preschool, National Children's Center, Washington, D.C.; and Helen Rubin, Director of Preschool, Montgomery County Association for Retarded Citizens, Silver Spring, Maryland.Helen RubinCatherine Deuoney, Administrative Assistant Preschool, Montgomery County Association for Retarded Citizens, Silver Spring, Maryland; Michael j. Guralnick, Director of Research and Experimental Preschool, National Children's Center, Washington, D.C.; and Helen Rubin, Director of Preschool, Montgomery County Association for Retarded Citizens, Silver Spring, Maryland.
Wylie et al. (Mon,) studied this question.