Figure 4.

Contrast sensitivity is similar across areas. A, Schematic of size-by-contrast-tuning experiments. During 2P imaging, mice are presented circularly-apertured gratings of variable size and contrast at a fixed position. B, Contrast-response extraction in an example cell. Response values at the cell's preferred size (red line and circles, found at the highest contrast) were extracted from size-tuning curves across four contrasts (gray curves). Inset, Contrast response function for this cell fit with the Naka–Rushton equation. Vertical line is C₅₀. C, Summary of averaged normalized contrast response functions at the preferred size across areas. Error bars indicate ±SEM across cells. Fits are of average contrast response measures. D, Summary of C₅₀ for all cells in each area.