In his original studies of digestion, pavlov placed food on a dog's tongue to make the dog salivate. in this situation, the dog's salivating was a(n):

unconditioned response (UCR).

Explanation:

Unconditioned response (UCR) -

In an organism , unconditioned response is generated from the unconditioned stimulus.

These are the cases where the organism response in a very normal and natural manner to any external or internal stimulus.

These behaviors are not taught by anyone .

Hence, from the scenario of the question, the dog's salivating was an unconditioned response (UCR) .

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hope this .

which sentences ? that question is incomplete