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

We discovered an error in the implementation of the function used to generate radial frequency (RF) distortions in our article (Wallis, Tobias, Bethge, & Wichmann, 2017).

Detecting distortions of peripherally presented letter stimuli under crowded conditions.

When visual features in the periphery are close together they become difficult to recognize: something is present but it is unclear what. This is called "crowding". Here we investigated sensitivity to features in highly familiar shapes (letters) by applying spatial distortions.