Influence of drifting dot-field stimulus direction on wave propagation direction. A, Snapshots of phase maps and phase velocity fields before stimulus onset for stimulus drifting in the 90° direction. White arrows show mean velocity vector across all recording sites at double scale. B, Histogram of PVF mean direction before stimulus onset across all trials in this recording (n = 100) for 90° stimulus direction. C, Same as A, but for 180° stimulus direction. D, Same as B, but for 180° stimulus direction. E–H, Same as A–D, but after stimulus onset. I, Circular average of PVF mean direction across all trials in this recording. Shading shows circular SD (Philipp, 2009).