The "psychic secretions" that interfered with Pavlov's experiments on digestion were:

Aprimary reinforcers.

Bconditioned responses.

Cconditioned stimuli.

Dsecondary reinforcers.

Eunconditioned responses.

Verified Answer :

the psychic secretions that interfered with pavlov's experiments on digestion were : B. Conditioned response

In pavlov experiment, he told a helper to bring food to his dog. After doing this for a prolonged period of time, the dog will be salivated everytime it see the helper, even without food. in this case, we can say that The dog's response already been conditioned.