Question

question 51
garcia and koellings findings on taste aversion in rats challenged the previously accepted principle that
a the us must immediately follow the cs for conditioning to occur.
b learning occurs only if a response is followed by reinforcement.
c positive reinforcement is more effective than punishment in changing behavior.
d learning is influenced by the frequency of association between the cs and us.

Explanation:

Garcia and Koelling's taste - aversion experiments showed that rats could develop an aversion to a taste (CS) even when the illness (US) occurred hours later. This challenged the classical conditioning principle that the US must immediately follow the CS for conditioning to occur.

Answer:

A. the US must immediately follow the CS for conditioning to occur.