Summary of single-channel properties of AMPA receptors at developing thalamocortical synapses. A, mEPSC_fast 10-90% rise time plotted versus γ for all cells (n = 35). B, mEPSC_fastτ_decay plotted versus γ for all cells (n = 35). The line is a linear regression, and τ_decay is weakly but significantly correlated with γ (r = 0.389; p < 0.05). C, mEPSC_fast amplitude plotted versus γ for all cells (n = 35). D, Estimated number of channels contributing to mEPSC_fast plotted versus γ for all cells (n = 35). The line is a fit to the data of the following form: number of channels = Q/γ× 0.07, iterated with Q as the free parameter; Q = 1 0.3 ± 0.45 pA; r² = 0.94. The number of channels is significantly correlated with γ (p < 0.0001).