Figure 1.

Depiction of a single trial in Experiment 1 (left) and observed Change Preference Scores (right). Each circle in the right panel represents the median preference score from a single infant; the individual circles are scaled to the number of trials completed and values are scattered horizontally solely to make the individual circles easier to see. The black line within the cloud of circles indicates the mean of the preference scores, with the 95% confidence interval shown by error bars. * = p >. 05 for one-sample t test against chance.