According to gate-control theory, psychological, situational, or social factors can affect the experience of pain because:

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According to gate-control theory, psychological, situational, or social factors can cause the brain to send signals down the spinal cord to either open or close the "pain gates" which regulate the transmission of pain signals. This means that these factors can either enhance or inhibit the perception of pain. Option A is incorrect because the activation of A-delta and C fibers is related to the type of stimuli, not to psychological or other factors. Option B is incorrect because it describes the mechanism behind the gate-control theory but does not explain how psychological factors affect it. Option D is incorrect because stress actually increases the release of endorphins and enkephalins, which are natural painkillers.

According to Gate-Control Theory, Psychological, Situational, or Social Factors Can