Visualizing Dynamic Ambient/Focal Attention with Coefficient $$K$$

Using coefficient \(\mathcal{K}\), defined on a parametric scale, derived from processing a traditionally eye-tracked time course of eye movements, we propose a straightforward method of visualizing ambient/focal fixations in both scanpath and heatmap visualizations. The \(\mathcal{K}\) coefficient indicates the difference of fixation duration and following saccade amplitude expressed in standard deviation units, facilitating parametric statistical testing. Positive and negative ordinates of \(\mathcal{K}\) indicate focal or ambient fixations, respectively, and are colored by luminance variation depicting relative intensity of focal fixation.

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