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Frances Degen Horowitz, Infant Attention and Discrimination: Methodological and Substantive Issues, Monographs of the Society for Research in Child Development, Vol. 39, No. 5/6, Visual Attention, Auditory Stimulation, and Language Discrimination in Young Infants (Dec., 1974), pp. 1-15
Frances Degen Horowitz (Sun,) studied this question.