Abstract
Thirty toddlers selected for linguistic precocity were administered standardized measures of cognitive and language development at ages 20, 24, and 30 months, including the Bayley Mental Scale and selected tests from Stanford-Binet Fourth Edition (S-B IV) (20 months); S-B IV and Peabody Picture Vocabulary Test, Revised (PPVT-R) (24 months); and S-B IV, Stanford-Binet Form L-M (S-B L-M), and PPVT-R (30 months). S-B IV yielded composite scores lower than those of the other cognitive measures, particularly at 24 months. Except for S-B IV at 24 months, there was substantial correspondence within domains, not only within a single age but across ages. Validity of the S-B IV at 24 months appears questionable, even with this linguistically advanced group. Practical roblems in use of this test with very young children were discussed.
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