1. The dissection of behavioral phenomena begins around 8-9 months, when infants get caught up in an unending "throwing objects game":
pushing a spoon off the dining chair, watching it fall, and having their mother pick it up, then throwing it again. Sometimes they even forcefully smash toys against the wall. Mothers often tend to define this as "willfulness", "wasting energy", or "testing the patience of adults".
2. The core variables behind the behavior:
Three-dimensional spatial dynamics and the advancement of object persistence. From the perspective of developmental psychology in cognition, this is the first "gravity and dynamics experiment" that infants conduct in the macroscopic physical world: the exploration of spatial trajectory (Trajectory Schema): At this stage, infants begin to understand the logical movement of objects in space. By throwing objects, their gaze will closely follow the parabolic trajectory of the object, which helps the visual cortex of the occipital lobe develop visual tracking ability and establish the depth perception of "hand-eye coordination".
Macro empirical evidence of causality: "I apply a force", "The object detaches from me", "The object makes a collision sound in the distance". This continuous physical feedback enables infants to first confirm that they have the power to change the state of external physical objects. At the same time, mothers repeatedly picking them up is helping them strengthen the social causal logic of "concealment and recurrence".
