Human Cognitive Neuroscience, Psychology, University of Edinburgh, UK.
Cortex. 2018 Oct;107:220-228. doi: 10.1016/j.cortex.2017.07.011. Epub 2017 Jul 25.
The line bisection task is widely used in the study of neglect. Some years ago, McIntosh, Schindler, Birchall, & Milner (2005) proposed a radical reframing of this ubiquitous task. Rather than using the traditional measure of directional bisection error, they quantified the sensitivities of the response to the changing locations of the left and right endpoints of the line, expressing these as 'endpoint weightings'. A novel prediction generated from their analysis was that manipulations increasing attention to the left end of the line should cause an increase in the left endpoint weighting and a corresponding reduction in the right endpoint weighting. The present study fulfilled this prediction, using a forced-report cueing method in a group of 12 patients with left neglect. The data confirm an antagonistic relationship between endpoint weightings, consistent with the idea that they represent the sharing of a finite resource. It is argued that the endpoint weightings model of line bisection offers a sensitive and uniquely useful framework for studying competitive lateral biases of attention in neglect, and may also provide insight into non-lateralised attentional impairments.
二分线任务在忽视研究中被广泛应用。几年前， McIntosh、Schindler、Birchall 和 Milner（2005）对这个无处不在的任务提出了彻底的重新构想。他们没有使用传统的定向二分线误差测量方法，而是量化了对线条左右端点变化位置的反应灵敏度，将其表示为“端点权重”。他们的分析产生了一个新的预测，即增加对线条左端点的注意力的操作应该会导致左端点权重增加，相应地减少右端点权重。本研究使用一组 12 名左侧忽视患者的强制报告提示方法验证了这一预测。数据证实了端点权重之间的拮抗关系，这与它们代表有限资源共享的观点一致。有人认为，二分线的端点权重模型为研究忽视中注意力的竞争横向偏差提供了一个敏感而独特的有用框架，也可能为非横向注意力损伤提供了一些见解。
