Calvin was chased and assaulted by an aggressive rooster when he was barely 3 years old. As an adult, he still gets little twists in his stomach when he hears the word rooster, and he claims that birds make him nervous.

What is the unconditioned stimulus in this example?

A. The word rooster
B. The rooster who attacked Calvin
C. Twists in Calvin's stomach/feeling nervous
D. Calvin

B. The rooster who attacked Calvin

Explanation:

According to classical conditioning, the conditioned stimulus is the word rooster while the unconditioned stimulus is the rooster that attacked Calvin and the conditioned response is the twists in Calvin's stomach/feeling nervous.

Classical conditioning is a type learning whereby an unconditioned stimulus (the rooster who attacked Calvin) is associated with a conditioned stimulus (the word rooster) to elicit a conditioned response (twists in Calvin's stomach/feeling nervous) in a the subject.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals