Materials
A plastic doorbell button, approximately 3 inches tall, and a dome light, approximately
5 inches in diameter, were mounted on a wall in the testing room (attached with
Velcro). The objects were mounted 30 inches high so that infants could easily
manipulate them. When pressed, the doorbell button chimed through a speaker
located in the wall (triggered by the experimenter). The dome light, when pressed,
became illuminated.
MaterialsA plastic doorbell button, approximately 3 inches tall, and a dome light, approximately5 inches in diameter, were mounted on a wall in the testing room (attached withVelcro). The objects were mounted 30 inches high so that infants could easilymanipulate them. When pressed, the doorbell button chimed through a speakerlocated in the wall (triggered by the experimenter). The dome light, when pressed,became illuminated.
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