Figure 2.

Spatial-temporal noise targets and experimental design. A, Schematic representation of the “noisy dots” pursuit direction discrimination task. The dots move with a fixed speed but different directions, randomly chosen anew at each update interval. Trials consisted of a fixation interval, a noise interval, a coherent motion interval, and a final fixation interval. B, Direction noise targets. Top, Direction of a single dot over time. Bottom, Average direction of all dots in the pattern. Dot speeds are uniform and constant. C, Speed noise targets. Top, Speed of a single dot over time. Bottom, Average speed of all dots. Dot directions are uniform and constant.