CR refers to the conditioned response. It is an idea in psychology. Conditioned response (CR), also sometimes called a conditioned reflex, as "the learned or acquired response to a conditioned stimulus
b. The CR is strengthened if the conditional stimulus and unconditional stimulus are paired frequently
c. Extinction of a classically conditioned response involves presentation of only the CS
In other words, the CS is removed.
d. Extinction causes the CR
to grow gradually WEAKER
2. A typical nonsense syllable is a three-letter consonant-vowel-consonant sequence
known as a trigraph
3. In serial learning, the organization of information in which lists are presented for participants to learn is alternated with associative clustering where they recall the lists.
Therefore, the answers are as given above.
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