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. Author manuscript; available in PMC: 2008 Oct 1.
Published in final edited form as: Vision Res. 2007 Sep 18;47(23):2943–2955. doi: 10.1016/j.visres.2007.07.010

Figure 1. Stimulus for measuring temporal thresholds for letter recognition.

Figure 1

In a trial, a string of three randomly selected letters (trigrams) was displayed in a horizontal configuration for a designated exposure time. Subjects used either their preferred retinal locus (for those with scotomas) or central vision (for those without scotomas including normal vision subjects) to fixate at the mid point between the two vertically displayed green dots (shown as grey in this figure) and reported the 3 letters from left to right. A letter was counted as correct only if it was identified correctly in the correct order. Except where specified otherwise, data in this paper refer to recognition accuracy for the middle letter.