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Percept."],"published-print":{"date-parts":[[2016,5,28]]},"abstract":"<jats:p>We introduce coefficient<jats:italic>K<\/jats:italic>, defined on a novel parametric scale, derived from processing a traditionally eye-tracked time course of eye movements. Positive and negative ordinates of<jats:italic>K<\/jats:italic>indicate<jats:italic>focal<\/jats:italic>or<jats:italic>ambient<\/jats:italic>viewing, respectively, while the abscissa serves to indicate time, so that<jats:italic>K<\/jats:italic>acts as a dynamic indicator of fluctuation between ambient\/focal visual behavior. The coefficient indicates the difference between fixation duration and its subsequent saccade amplitude expressed in standard deviation units, facilitating parametric statistical testing. To validate<jats:italic>K<\/jats:italic>empirically, we test its utility by capturing ambient and focal attention during serial and parallel visual search tasks (Study 1). 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