According to the classic view of mental categorization, categories are based around necessary and sufficient features

Which statement is most true regarding cardiac vagal tone?

A) It is measured by recording the number of heart beats exhibited per minute. B) It is reflective of nervous system development. C) It is less predictive of infant state regulation than general heart rate. D) It primarily is reflective of cardiovascular development, and its effects on the nervous system.

John, "Mr. Anxiety," finally musters up the courage to ask the beautiful and popular Carole to go to the movies. She finds the idea so ridiculous that she laughs out loud the instant he has gotten the question out. John's face turns the color of a steamed lobster. In classical conditioning terms, John's experience is an example of ________

a. trace conditioning b. delayed conditioning c. simultaneous conditioning d. backward conditioning