Figure 6.

Attentional Operating Characteristics. Saccadic performance (represented by the value of weighting parameter α, Eq. 1) vs. Perceptual performance (represented by slope of the psychometric functions at the 50% point). Performance plotted along each axis comes from single-task (saccadic or perceptual) results. Intersection of single-task results (dashed line) is the independence point. Remaining data points show dual-task results (saccadic and perceptual task concurrently) when saccades and perceptual judgments were based on the same set of elements (triangle), or saccades and perceptual judgments were based on different sets of elements under instructions to give higher priority to the saccadic task (diamonds) or to the perceptual task (squares). Each datum point is based on approximately 100 observations.