Fig. 1.

Illustrations of the hypotheses. The colored rectangles represent a series of hand and eye contacts with an object; the duration of each contact is indicated by the length of the rectangle. The different colors represent different objects: blue → the blue object; red → the red object; green → the green object. (A) Expectation for hand contact. Children in the heavy-object condition would have more short but frequent hand contacts than those in the light-object condition because of the weight of the objects. (B) Temporal alignment hypothesis for visual attention. If manual actions and gaze are tightly aligned in time, then altering the temporal structure of manual actions would lead to corresponding changes in the temporal structure of gaze. (C) Interest hypothesis for visual attention. If looking behavior is driven by interest, then gaze durations should not differ as long as the hand actions (continuous contact or intermittent contact) remain on the same object.