The words that best describe the tone of the Watson quote in paragraph 3 is;
In paragraph 3 of "Classical Conditioning" by Saul McCleod, John Broadus Watson is quoted as saying that if any healthy infants are given to him from a selected dozen, he had the capacity to make them become whatever he chose.
They could become lawyers, doctors, merchants, beggars, etc. His tone was confident and insistent as we can see him being so sure of what he was saying.
Watson was thus saying that experiential learning is responsible for the differences in human behavior.
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