Manassi M, Sayim B, Herzog M H, 2010, "In contextual modulation, bigger is not better for low luminance stimuli" Perception 39 ECVP Abstract Supplement, page 28
In contextual modulation, bigger is not better for low luminance stimuli
M Manassi, B Sayim, M H Herzog
Performance on a target can be modified by contextual elements. For example, thresholds strongly increase when a Vernier is flanked by two lines. Increasing the number of flankers reduces contextual interference when the flankers are shorter or longer than the Vernier: bigger is better. However, there is no improvement when flankers have the same length as the Vernier [Malania et al, 2007 Journal of Vision 7(2):1, 1–7]. Stimuli were 80 cd/m² on a black background. Here, we used stimuli with the luminance of 1 cd/m². Performance deteriorated similarly as in the 80 cd/m² condition when the Vernier was flanked by two lines that were longer than the Vernier. However, increasing the number of flankers did not improve performance as in the 80 cd/m² condition: bigger is not better. Our results show that contextual modulation is highly dependent on the luminance of the stimuli.
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