Key points are not available for this paper at this time.
John Colombo, D. Wayne Mitchell, Frances Degen Horowitz, Infant Visual Attention in the Paired-Comparison Paradigm: Test-Retest and Attention-Performance Relations, Child Development, Vol. 59, No. 5 (Oct., 1988), pp. 1198-1210
Colombo et al. (Sat,) studied this question.