Figure 6.

Control experiments. Accuracy data from 3 observers at 3-Hz rate for MV and SA and 4 Hz for PC. The dashed line at 50% represents chance performance. The No Guide and the Moving Guide conditions duplicate the stationary and moving attention conditions of Experiment 1 but at the fixed rate (3 or 4 Hz). The 1 Stationary Guide condition had a ring at the bottom location on alternate frames, always encircling the same paring (Figure 4). The Longer Duration condition was the same as the 1 Stationary Guide but with twice the number of test arrays. The 5 Stationary Guides had a ring around all target pairings on each array (Figure 5). In the Random Guide condition, the guide moved to random positions on each array and observers attempted to attend to it. Click on the link here to see a demonstration movie at 4 Hz where reporting the pairing of color and motion within the randomly moving guide may be difficult.