The missing-colour effect: The attentional beam captures reading-relevant and reading-irrelevant information.

According to many models, reading is driven by an attentional beam. In two experiments, we investigated the specificity of the beam by testing its sensitivity to a reading-irrelevant feature: colour. More specifically, participants were asked to read either a black-and-white version or a multi-colour version of the text in which each letter was printed in a different colour. In addition, while reading for comprehension, participants either searched for a target letter (t or d) or for a colour (pink or black). In Experiment 1, we used the Nelson-Denny reading test and in Experiment 2, we used an experimental text. In both the experiments, the typical missing-letter effect was observed with letters: Participants missed more letters in function than in content words. Most importantly, although the effect was smaller, this pattern of results was also observed when participants searched for a colour (e.g., pink or black letters in a multi-coloured passage). Our results suggest that the attentional beam involved in reading is sensitive to both reading-relevant and reading-irrelevant information.