According to the gate theory of pain,

A) each successive experience of pain is more intense than the last one.
B) messages from the brain to the spinal cord can decrease the sensation of pain.
C) the experience of pain depends on stimulation of hair cells.
D) a given neuron can send a signal of pain at one time, touch at another, and olfaction at still another.

The gate theory of pain suggests that messages from the brain to the spinal cord can decrease the sensation of pain. This occurs because the transmission of pain signals from the spinal cord to the brain can be modulated or "gated" by signals coming from other sensory modalities or descending from the brain itself. Thus, the experience of pain can be influenced by factors such as attention, expectation, and emotion. The theory does not suggest that each successive experience of pain is more intense, that hair cells are involved in pain sensation, or that a given neuron can send signals for different sensory modalities at different times.