Fig. 2.

Stimulus and procedure. (a) Graphical depiction of the near- and far-proximity conditions. Stimuli were shown symmetrically about the tangent of imaginary radial lines extending from fixation on an imaginary circle with a diameter of 14° of visual angle. Two example conditions are shown in the figure: a far-proximity condition in which the two pinwheels are displayed in the lower visual field separated by the vertical meridian and a near-proximity condition in which the two pinwheels are located in the upper right quadrant. (b) Tracking procedure. At the beginning of each trial, one of the spokes on each of the two pinwheels was cued. Subjects would track the targets for a period of 3 s. One of the spokes on the two pinwheels was then cued, and subjects would report whether the cue was located on one of the spokes they were tracking.