Figure 5

The effects of parecoxib and fentanyl on MU (Multi-Unit) and Non-uniform index of MU recordings. A: Spike mean firing rate from MU recordings were not altered in the presence of nociceptive stimulation. B: The non-uniform index of MU was decreased when nociceptive stimulus was applied (control), indicating that the neuronal firing pattern was more uniform under nociceptive stimulation than during the resting state. Fentanyl partially inhibited this response while parecoxib had no effect. *P < 0.05, **P < 0.01, #P < 0.001.