ABSTRACT
When Sara, a 3-month-old infant, accidentally brushes a rattle with her hands, the sound that follows sur-
prises her. For a small baby, events such as this are unpredictable and unknown. A few months later, when
Sara sees the rattle, picks it up, and shakes it to hear the noise, she has brought a bit of order into her world.
She has learned to relate a visual experience, an action, and feelings of grasping and shaking to the occur-
rence of a sound.
