Department of Psychology, Faculty of Health & Life Sciences, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK.
School of Psychology, College of Social Science, University of Lincoln, Lincolnshire, LN6 7TS, UK.
Body Image. 2019 Jun;29:31-46. doi: 10.1016/j.bodyim.2019.02.006. Epub 2019 Mar 8.
A modified version of the bubbles masking paradigm was used in three experiments to determine the key areas of the body that are used in self-estimates of body size. In this paradigm, parts of the stimuli are revealed by several randomly allocated Gaussian "windows" forcing judgements to be made based on this partial information. Over multiple trials, all potential cues are sampled, and the effectiveness of each window at predicting the judgement is determined. The modified bubbles strategy emphasises the distinction between central versus edge cues and localises the visual features used in judging one's own body size. In addition, eye-movements were measured in conjunction with the bubbles paradigm and the results mapped onto a common reference space. This shows that although observers fixate centrally on the torso, they are actually directing their visual attention to the edges of the torso to gauge body width as an index of body size. The central fixations are simply the most efficient way of positioning the eye to make this estimation. Inaccurate observers are less precise in their central fixations and do not evenly allocate their attention to both sides of the torso's edge, illustrating the importance of efficiently sampling the key information.
在三个实验中使用了一种改进的气泡掩蔽范式，以确定用于自我估计身体大小的身体关键区域。在这个范式中，刺激的部分通过几个随机分配的高斯“窗口”揭示，迫使根据此部分信息进行判断。在多次试验中，采样了所有潜在的线索，并且确定了每个窗口预测判断的有效性。修改后的气泡策略强调了中央与边缘线索之间的区别，并定位了用于判断自己身体大小的视觉特征。此外，还结合气泡范式测量了眼动，并将结果映射到共同的参考空间。这表明，尽管观察者将注视集中在躯干上，但实际上他们将视觉注意力集中在躯干的边缘，以衡量躯干的宽度作为身体大小的指标。中央注视点只是定位眼睛进行这种估计的最有效方法。不准确的观察者在中央注视点上的精度较低，并且不会均匀地将注意力分配到躯干边缘的两侧，这说明了有效采样关键信息的重要性。
