Figure 8.

Peak velocities of VSD signal and MUA. Top: The mean ΔV(t) rel(t) signal from all animals taken from 15 locations at the 17/18 border and along the path of the moving object representation. Again upwards and downwards movement conditions have been pooled. (A) For a bar moving from CFOV the peaks move with a mean velocity of 0.039 mm ms⁻¹ in the time interval shown. (B) For a bar moving from the peripheral FOV the peak activity propagates over cortex with a mean velocity of 0.005 mm ms⁻¹. Bottom: The mean MUA rel(t) averaged over the 16 leads of the laminar probe for all animals at five sites along the path of the moving object representation on the 17/18 areal border. Downwards and upwards movement conditions are pooled. Color scale is the same as top. (C) Bar moving from CFOV. The peak MUA moves with an average velocity of 0.0055 mm ms⁻¹ for the first 980 μm. (D) Bar moving from peripheral FOV. The peak MUA moves with an average velocity of 0.005 mm ms⁻¹.