Figure 4. Contribution of glycine receptor-mediated inhibition to potassium-evoked rhythmic activity in rat substantia gelatinosa in vitro.

A, potassium-induced rhythm before (left panel) and after 30 min 10 μm strychnine (middle panel). B, strychnine reversibly reduced the power of the spectrum. C, there was no effect of strychnine on the frequency of the oscillation. D, quantified data (n = 6) reveal that strychnine significantly reduces the parameters of peak power amplitude and power area with no significant effect on the frequency of activity. *P < 0.05 paired t test versus control.