Explored early-developing predictions of object motion through 6-month-old infants' head tracking and reaching for moving objects. Found evidence for infants' extrapolation of object motion on linear paths, in accord with principle of inertia. This tendency was remarkably resistant to counter-evidence, observed even after repeated presentations of…

Investigated whether infants infer that a hidden, freely moving object will move continuously and smoothly. Six- to 10- month olds inferred that the object's path would be connected and unobstructed, in accord with continuity. Younger infants did not infer this, in accord with inertia. At 8 and 10 months, knowledge of inertia emerged but remained…

Examined whether infants believe that size of a moving object striking a stationary object will affect how far the stationary object is displaced. Found that the infants did believe the size of the test cylinder affected the length of the test object's displacement and that they used the initial familiarization event to calibrate their predictions…