Eye gaze patterns reveal how reasoning skills improve with experience

Transitive inference task. a Sample stimulus array, with four relations at the top and the question at the bottom. In this sample problem, participants had to encode that the blue ball was heavier than the orange one, and that the orange and purple balls were equally heavy, to determine that the blue ball was heavier than the purple one. b Eyetracking adaptation from refs. 18,19: each trial began with a fixation cross in the center of the screen (1000？ms) that cued participants to fixate on it, followed by the presentation of the question and target balls. After 100？ms, four scales would appear, only two of which were relevant to the problem. A trial ended immediately after the participant pressed a button to indicate which of the two target balls was heavie