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. Author manuscript; available in PMC: 2009 Sep 7.
Published in final edited form as: Vision Res. 2008 Jan 31;48(6):788–798. doi: 10.1016/j.visres.2007.12.011

Figure 2.

Figure 2

Threshold elevation, ratio of contrast threshold for identifying flanked and unflanked (single) letters, is plotted as a function of letter separation in (A) degrees or (B) multiples of letter size, for the four trigram conditions. Data shown are obtained from observers AP and RH, but are representative of other five observers. Solid lines represent the best-fit curves (see text for details) through each set of data. Dashed lines represent the null effect (absence of threshold elevation). Error bars represent ± 1 S.E.M.