In classical conditioning of a fear response, if long-term potentiation (LTP) is prevented or blocked:
A. additional NMDA receptors have been inserted into the postsynaptic cell.
B. additional AMPA receptors have been inserted into the postsynaptic cell.
C. there are increased EPSPs in the postsynaptic cell.
D. the animal will not display fear conditioning.
Answer: D
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Fill in the blank with the appropriate word.