Figure 4.

Evoked responses in V1 are not restricted to the retinotopy of the initial response. A, Peak maps of the response of V1 to the presentation at four different location of the screen of a 9 × 9° bright square (luminance: 153 Cd/m²) on a gray background (luminance: 83 Cd/m²) (n = 10 trials for each location). For each position, a peak map was computed between 50 and 100 ms (top), and 100 and 150 ms (bottom). B, Superimposition of the peak maps shown in A. Each peak map has been assigned a color as indicated in the inset above. Colors have been set in transparency so pixels activated by more than one position appear in a shade resulting from the mix of primary colors. Threshold of 4 SD correspond to 0.06% of ΔF/F.