Abstract
The aim of the present paper was to apply the ex-Gaussian function to data reported by Parris et al. (2012) given its utility in studies involving the Stroop task. Parris et al. showed an effect of the word blindness suggestion when Response-Stimulus Interval (RSI) was 500 ms but not when it was 3500 ms. Analysis revealed that: (1) The effect of the suggestion on interference is observed in μ, supporting converging evidence indicating the suggestion operates over response competition mechanisms; and, (2) Contrary to Parris et al. an effect of the suggestion was observed in μ when RSI was 3500 ms. The reanalysis of the data from Parris et al. (2012) supports the utility of ex-Gaussian analysis in revealing effects that might otherwise be thought of as absent. We suggest that word reading itself is not suppressed by the suggestion but instead that response conflict is dealt with more effectively.
Highlights
The Stroop task is a selective attention task that requires participants to identify the color of the font in which a word is presented, whilst ignoring the word itself (Stroop, 1935; see MacLeod, 1991, for a review)
When the written word is incongruent with the font color, the time it takes to identify the color is increased relative to a baseline control condition, a difference known as Stroop interference
Ex-Gaussian analysis of the data from Parris et al revealed that the post-hypnotic word blindness suggestion takes its effect in μ, the modal portion of the reaction time (RT) distribution, in the present data set
Summary
The Stroop task is a selective attention task that requires participants to identify the color of the font in which a word is presented, whilst ignoring the word itself (Stroop, 1935; see MacLeod, 1991, for a review). When the written word is incongruent with the font color (e.g., green written in red), the time it takes to identify the color is increased relative to a baseline control condition (e.g., flower written in red), a difference known as Stroop interference. When the color and word are congruent (e.g., red written in red) the time it takes to identify the color is decreased relative to the baseline control condition, a difference known as Stroop facilitation. Orthodox statistics: which side are you on.
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