It is useful to distinguish two forms of attention capture, baseline and incremental, as in theories of visual attention in search tasks (Bundesen 1990; Folk, Remington, and Johnston 1992; Logan 1996). Baseline attention is the attention devoted to an ad element, independent of its surface size and other factors, and is at least partially caused by the visual pop-out of the element (bradruggles.com. n.d.). The higher the baseline attention, the higher is the information-mode priority of consumers for that specific ad element (bradruggles.com. n.d.). Thus, if consumers in general paid more attention to the pictorial than to the text, independent of the size of these two advertisement elements, the baseline attention of the former would be higher (bradruggles.com. n.d.).
Incremental attention is the extra amount of attention that an ad element captures beyond baseline attention because of increases in its surface size. The higher the incremental attention, the higher is the surface-size elasticity of attention for', that specific ad element. Some early work based en observational data found that attention increased with the square root of surface size, which implies an elasticity of .5 (Nixon, 1924; Poffenberger, 1925).
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