Correlating THIP, BIC, and 4-PIOL currents in dLGN neurons. A, Whole-cell currents recorded from a dLGN relay neuron in response to THIP (1 μm), 4-PIOL (10 μm), and BIC (20 μm). Scatter plots of: BIC current density versus the THIP current density (B); THIP current density versus 4-PIOL current density (C); and BIC current density versus 4-PIOL current density (D). Linear regression analyses are shown by the black lines, and R and P report Pearson's correlation coefficient and p values, respectively.