Figure 2.

Effects of different velocities on ST map patterns. All contractions started simultaneously at the left but propagated at different velocities (1x, 2x, 4x and 6x). There is an appearance in the ST map that the slower contractions are more prominent than those created at faster speeds. This is an illusion as the shift between each time step is greater at higher speeds, resulting in a 'thinner' appearance (see lower schematic diagram).