Background While current practices strive to include individuals with intellectual disabilities in community opportunities, stigmatizing attitudes held by the public can be a barrier to achieving true social inclusion. Methods A sample of 625 community members completed the Social Distance Subscale of the Multidimensional Attitude Scale on Mental Retardation. Results Older and less educated participants held attitudes that reflected greater social distance. Participants who had a close family member with an intellectual disability and those who perceived the average level of disability to be 'mild' expressed less social distance. The limited variability in scores leads us to question our overall finding of very favourable attitudes towards social interaction with persons with intellectual disabilities.Conclusions This study demonstrates that although certain demographic variables are still relevant in identifying social distance attitudes, the measurement of this construct requires revision to ensure a valid and sensitive reflection of the public's attitudes.

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Texture boundary segmentation is conventionally thought to be mediated by global differences in Fourier energy, i.e., low-order texture statistics. Here, we have examined the importance of higher order statistical structure of textures in a simple second-order segmentation task. We measured modulation depth thresholds for contrast boundaries imposed on texture samples extracted from natural scene photographs, using forced-choice judgments of boundary orientation (left vs. right oblique). We compared segmentation thresholds for contrast boundaries whose constituent textures were either intact or phase scrambled. In the intact condition, all the texture statistics were preserved, while in the phase-scrambled condition the higher order statistics of the same texture were randomized, but the lower order statistics were unchanged. We found that (1) contrast boundary segmentation is impaired by the presence of higher order statistics; (2) every texture shows impairment but some substantially more than others; and (3) our findings are not related to scrambling-induced changes in detectability. The magnitude of phase-scrambling effect for individual textures was uncorrelated with variations in their amplitude spectra, but instead we suggest that it might be related to differences in local edge structure or sparseness.

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