Abstract
Young children were tested with the Bayley Mental Scale in a familiar home setting and unfamiliar research room. Thirty-six children, 18 boys and 18 girls, between 16 and 21 months were tested both at home and in the research laboratory, in two groups having different orders. Those children tested first in the laboratory and then in the home had a statistically significant increase of 9.8 points in the mean Mental Development Index; there was no increase for those tested first in the home and then the laboratory. Examination of item groupings suggested that the effect was largely upon verbal performance.
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