Perceptual Grouping and Distance Estimates in Typical and Atypical Development: Comparing Performance across Perception, Drawing and Construction Tasks

Perceptual grouping is a pre-attentive process which serves to group local elements into global wholes, based on shared properties. One effect of perceptual grouping is to distort the ability to estimate the distance between two elements. In this study, biases in distance estimates, caused by four types of perceptual grouping, were measured across three tasks, a perception, a drawing and a construction task in both typical development (TD; Experiment 1) and in individuals with Williams syndrome (WS; Experiment 2). In Experiment 1, perceptual grouping distorted distance estimates across all three tasks. Interestingly, the effect of grouping by luminance was in the opposite direction to the effects of the remaining grouping types. We relate this to differences in the ability to inhibit perceptual grouping effects on distance estimates. Additive distorting influences were also observed in the drawing and the construction task, which are explained in terms of the points of reference employed in each task. Experiment 2 demonstrated that the above distortion effects are also observed in WS. Given the known deficit in the ability to use perceptual grouping in WS, this suggests a dissociation between the pre-attentive influence of and the attentive deployment of perceptual grouping in WS. The typical distortion in relation to drawing and construction points towards the presence of some typical location coding strategies in WS. The performance of the WS group differed from the TD participants on two counts. First, the pattern of overall distance estimates (averaged across interior and exterior distances) across the four perceptual grouping types, differed between groups. Second, the distorting influence of perceptual grouping was strongest for grouping by shape similarity in WS, which contrasts to a strength in grouping by proximity observed in the TD participants

Ethical dilemmas in researching sensitive issues online: lessons from the study of British disability dissent networks

This paper presents an unconventional approach to the resolution of the key ethical dilemmas raised by the study of politically charged personal content posted on social media. In particular, this study suggests that Internet research ethics should remain informed by the disciplinary perspectives of those who study online communities. Hence, Internet scholars must build on established ethical practices from their respective disciplines in such a way as to address these ‘human-centred’ ethical issues. A ‘medium-cloaked’ strategy towards data anonymization was adopted for this study of the comments posted on the Facebook pages of UK disability rights groups. Key themes were typically conveyed without the disclosure of personally identifiable information and direct quotes were only used if they could not be located using a search engine. The rationale for such an approach is elucidated in order to identify the limitations in the ways in which such ethical issues are dealt with in existing guidelines in this area. The paper suggests that the automatic categorization of disabled people and others experiencing disadvantage as ‘vulnerable groups’ in many of these protocols might further disempower these stakeholders through the omission of their personal stories from relevant scholarship. A more nuanced approach towards the protection of user privacy is advocated; one that allows for the use of direct quotes when it is unlikely to prove harmful to the user but also sets out to provide the maximum level of anonymity possible for those who divulge sensitive information in these semi-public spaces

Women in Sports

Please click the links below to view more information about each presentation. “Ain’t I An Athlete: Black Feminist Fitness in the Age of (Michelle) Obama” Courtney Marshall, University of New Hampshire “Push Back, Move Forward: A Feminist Theory of the Master\u27s Golf” Laura R. Woliver, University of South Carolina - Columbia “Intersectionality and Sport: Representing Shoni Schimmel, “Rez ball” and the Native American Imaginary” Mary G. McDonald, Georgia Institute of Technology - Main Campus “Good Will and Gracie (2007): A Critique of 21st Century Feminist Sports Cinema” Stacy L. Tanner, University of Central Florid