This study examines whether language-specific input influences children's
nonlinguistic spatial cognition as they acquire their first language. Recent
research on infant cognition has shown that preverbal infants can make a distinction
between tight-fit and loose-fit containment relations. This distinction is
systematically made in Korean (kkita‘fit tightly’), but
not in English (in). Using a preferential-looking method, this study tested
sensitivity to the distinction in English and Korean learners at different ages:
English learners were tested at 18, 24, 29 and 36 months, and Korean learners at 29
and 36 months of age. Results showed that while English learners weaken their
sensitivity to the distinction by 29 months of age, Korean learners maintain high
sensitivity to the distinction throughout the age periods tested. Language surveys
of the English learners indicate that weakening of the sensitivity occurs as the
children use the relevant spatial terms and increase their vocabulary level.