A physical therapist attempts to explain to a patient how electrical stimulation can help decrease the perception of pain. Which of the following descriptions would be used to explain the gate control theory of pain?

1. The threshold for stimulating peripheral nociceptors is decreased.
2. The threshold for stimulating peripheral nociceptors is increased.
3. Nociceptive signals are inhibited by stimulating non-nociceptive sensory nerves.
4. Nociceptive signals are inhibited when endorphins bind to opiate receptors.

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