A. Response traces and I-V plots for an OFF α cell under control conditions and in the presence of D-AP-5 (100 μM). The I-V plot becomes more linear in the presence of D-AP-5.
B. Contrast response functions for the three fitted conductances. The NMDA component of the fit was suppressed to near zero values in the presence of D-AP- 5. The number of cells at each contrast is indicated below the points in the D-AP-5 condition.
C. Same format as A. for an OFF δ cell. In the presence of D-AP-5, the U-shaped I-V relationship changed to a negative linear slope, indicating the suppression of a baseline inhibitory conductance (disinhibition).
D. Same format as B. for OFF δ cells.