PGA is dependent on action potentials and is not affected by glutamate receptor blockade. A. Normal-sized, biocytin-filled pyramidal neuron from a CD Type Ib case. Arrowheads indicate dendritic blebbing. B. PGA recorded at a holding potential of +10 mV in standard solution. Bath application of a selective NMDA receptor antagonist, APV, in conjunction with a non-NMDA receptor antagonist, NBQX, produced no discernible effect on PGA. In contrast, Na+ channel block with TTX completely abolished PGA, leaving only random mIPSCs. C. Autocorrelation histograms associated with traces shown in B. Note the lack of auto-correlation after blockade of Na+ channels.