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How does the visual system construct apparent contrast? Actual contrast obviously plays an important role, but exogenous attention to spatial location also plays a role (e.g., Carrasco, Ling & Read, 2004; Fuller, Rodriguez & Carrasco, 2007). Exogenous attention is automatically engaged by briefly presented peripheral “pre-cues”. However, previous studies used only highly salient precues. Little is known about the effect of pre-cue salience. We asked whether the increase in apparent contrast due to exogenous attention is “all-or-nothing” or whether it increases gradually with the salience of the pre-cue.

Cue salience modulates the effects of exogenous attention on apparent contrast