Figure 2.

Threshold to detect contrast changes depends on the strength of activation of PV+ interneurons. A, Representative behavioral performance during control trials (black) and during activation of PV+ interneurons (blue) with 0.37 mW/mm² (left), showing significant degradation of detection threshold, or 0.005 mW/mm² (right), showing little effect. B, Summary of effect of activation of PV+ interneurons at a range of power densities (light power normalized for area of light spot) for three mice.