Abstract
A spatial discrimination was successfully formed by 10-month-old infants during a single experimental session on the basis of secondary reinforcement. In the first task, Ss received paired presentations of a tone and cereal for touching a target. After each reinforcement, 23 sec elapsed before another could be received and S heard a second tone during this period. In the second task, Ss heard the food-paired tone ( T +) each time they touched one of 2 new targets and heard the second tone ( T n ) each time they touched the other target. The number of responses producing T + was reliably greater than the number producing T n , thus demonstrating a genuine secondary reinforcement effect.
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