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As the two far right columns of both tables show, when observers perceived illusory streaks with inducers having right angles (i.e., square inducers), the mean values of the illusion visibility range tended to be lower than those recorded in acute angle conditions. In addition, with square inducers, the illusion was not perceived in the two conditions in which contour luminance was 24 cd/m2. Table 2 Experimental results for three of four angular conditions, Sitaxentan when orientation of streaks was from bottom-left to top-right. Table 3 Experimental results for three of four angular conditions, when orientation of streaks was from top-left to bottom-right. FIGURE 10 Ranges of visibility of illusory streaks as function of contrast polarity and contrast magnitude. Figures are averages across participants and direction of effect. Although, these findings indicate the weaker persistence of illusory streaks in the 90�� condition, the average range in this condition could not be formally compared with the average ranges recorded for the star-like inducers, because there was only partial agreement in observers�� estimates. Also, a complete set of judgments could only be gathered when the inducers had acute corners. Consequently, only data for acute angle conditions were further analyzed. Acute Angles (Star Inducers) Data on the range of visibility of the effect were analyzed in a four-way, repeated-measures ANOVA including angle amplitude (46 and 62��), contrast polarity (positive or negative), magnitude of the selleck chemicals Michelson contrast between inducer surfaces and contours (three levels; see Table ?Table11) and direction of illusory streaks (left = top-left to bottom-right; right = bottom-left to top-right). The results showed two significant main effects (polarity and magnitude) and a significant two-way interaction between these factors. No significant differences were found in the vividness of the illusion across angle amplitudes or directions. No further significant interaction among any other factors in the ANOVA was found. Figure ?Figure1010 shows visibility ranges as functions of contrast polarity and contrast magnitude, CX-5461 order averaged across participants and the direction of the effect. The extent of the range when streaks persisted was significantly greater [F(1.19) = 22.38; p