Surround-Masking Affects Visual Estimation Ability.

The surround contrast by dot set interaction was nonetheless highly significant [ F (1,15) = 37.33, p < 0.001, partial η 2 = 0.71].

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A 2 (high/mid surround contrast) by 2 (fewer/more dots) within-subjects ANOVA of gray center stimuli revealed marginally significant main effect for surround contrast with gray center (grc) during visual estimation of dots ( Figure 3B ), where under high contrast surround conditions, the PCR for more and less dots were at or below chance level [ F (1,15) = 4.94, p = 0.042, partial η 2 = 0.25].

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