Longitudinal Corroboration of a Cross-Sectional Study of Development of Preschool Children with the Arrow-dot Test

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Abstract
Children in a Montessori preschool were administered a series of tests at the beginning of the school year and retested on the same battery 8 mo. later, at the end of the school year. The children exhibited a mean gain of about 11 points on the Peabody Picture Vocabulary Test IQ. They also exhibited a decline in Impuisivity and an increase in Superego scores, on the average, as measured by the Arrow-Dot Test. These longitudinal results corroborate an earlier cross-sectional analysis; and, as these results follow a prediction from Freudian theory, give indication of construct validity for the test.

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