L. Stone

Verghese, P., & Stone, L. S. (1996). Perceived visual speed constrained by image segmentation. Nature, 381, 161-3.
Verghese, P., & Stone, L. S. (1997). Spatial layout affects speed discrimination. Vision Research, 37, 397-406.
Verghese, P., & Stone, L. S. (1995). Combining speed information across space. Vision Research, 35, 2811-23.