Question

which of the following is not learned through operant conditioning?
a fish swims to the top of the tank when a light goes on
a rat learns to press a bar to get food.
dogs jump over a hurdle to avoid electric shock
pigeons learning to turn in circles for a reward
studying hard for good grades on psychology tests

Explanation:

Operant conditioning involves learning through consequences (rewards or punishments). In the case of a fish swimming to the top when a light goes on, this is likely classical conditioning (pairing a neutral stimulus - the light - with a reflexive response, perhaps related to feeding time which was previously associated with some other cue). For the rat pressing a bar (reward - food), dogs jumping to avoid shock (negative reinforcement - avoiding an aversive stimulus), pigeons turning for a reward (positive reinforcement), and studying for good grades (positive reinforcement - good grades as a reward), these are all examples of operant conditioning where the behavior is influenced by its consequences.

Answer:

A fish swims to the top of the tank when a light goes on.