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Daniel R. Anderson, Diane E. Field, Patricia A. Collins, Elizabeth Pugzles Lorch, John G. Nathan, Estimates of Young Children's Time with Television: A Methodological Comparison of Parent Reports with Time-Lapse Video Home Observation, Child Development, Vol. 56, No. 5 (Oct., 1985), pp. 1345-1357
Anderson et al. (Tue,) studied this question.