Modeling Infant 's Look on Trial : Race-Face Preference Depends on 's Looking Style.

When employing designs young infants' looking style is related to their development: Short looking (SL) infants are cognitively accelerated over their long looking (LL) peers. In fact, looking style is a variable, and depends on infant 's look distribution over trials. For the paired array setting, a model is provided which specifies the probability, π ∈ [0, 1], that is SL. The model is employed in a face preference study; 74 Caucasian infants were longitudinally assessed at 3, 6, and 9 months. Each viewed same race (Caucasian) vs. other race (African) faces. Infants become SL with development, but there are huge individual differences in rate of change over age. Three month LL infants, [Formula: see text], preferred other race faces. SL infants, [Formula: see text], preferring same race faces at 3, and other race faces at 6 and 9 months. Looking style changes precede and may control changes in face preference. Ignoring looking style can be misleading: Without considering looking style, 3 month infants show no face preference.