Correction to: Detecting distortions of peripherally presented letter stimuli 
under crowded conditions

Wallis, TSA; Tobias, S; Bethge, M; Wichmann, FA

doi:10.3758/s13414-019-01855-9

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Correction to: Detecting distortions of peripherally presented letter stimuli under crowded conditions

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Bethge, M
Research Group Computational Vision and Neuroscience, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Wichmann, FA
Dept. Empirical Inference, Max Planck Institute for Intelligent Systems, Max Planck Society;

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Citation

Wallis, T., Tobias, S., Bethge, M., & Wichmann, F. (2019). Correction to: Detecting distortions of peripherally presented letter stimuli under crowded conditions. Attention, Perception & Psychophysics, 81(8), 2968-2970. doi:10.3758/s13414-019-01855-9.

Cite as: https://hdl.handle.net/21.11116/0000-0004-B6BF-8

Abstract

We discovered an error in the implementation of the function used to generate radial frequency (RF) distortions1 in our article (Wallis, Tobias, Bethge, & Wichmann, 2017). Specifically, the phase offset (φ in Eq. 3 of Wilkinson, Wilson, & Habak, 1998) was specified incorrectly. Instead of causing a “rotation” of the RF pattern, the phase offset instead altered both the angular and radial components of the distortion, causing “swirls” that depended on the phase (see Fig. 1A). This means that the magnitude of the stimulus distortions depended on an interaction between the (randomized per stimulus) phase of the distortion and the shape of the letter.