Mitchell Alexandra G, Kandt Paulina O, McIntosh Robert D
Human Cognitive Neuroscience, Psychology, University of Edinburgh, Edinburgh, UK.
Center for Functionally Integrative Neuroscience, Aarhus University, Aarhus, Denmark.
Laterality. 2022 Jul;27(4):443-466. doi: 10.1080/1357650X.2022.2109657. Epub 2022 Aug 8.
This study assessed pseudoneglect using line bisection and perceptual landmark tasks in two matched online sessions. Line bisection bias was characterized by the traditional measure of Directional Bisection Error (DBE), and by Endpoint Weightings Bias (EWB), derived from an "endpoint weightings" analysis, made possible by the independent manipulation of left and right endpoints. EWB is proposed to index the relative attentional allocation to the two ends of the line. The expected leftward bias (pseudoneglect) was found, with larger effect sizes for EWB ( = -0.34 in both sessions) than for DBE (-0.22 in Session 1 and -0.14 in Session 2). Although EWB was slightly less reliable than DBE, it was more sensitive to pseudoneglect, and the endpoint weightings method has further advantages, including the option of an additional measure of non-lateralized attention. A substantial proportion of participants had difficulty following the instructions for the landmark task, which highlights the need for clear instructions and performance checks for this task. This study shows that line bisection can be used to measure pseudoneglect online, and provides grounds to suggest that the task should routinely include the independent manipulation of left and right endpoints, so that an endpoint weightings analysis can be performed.
本研究在两个匹配的在线环节中，使用线段二等分和知觉地标任务评估了假性忽视。线段二等分偏差通过传统的方向二等分误差（DBE）测量方法以及端点加权偏差（EWB）来表征，EWB源自“端点加权”分析，这种分析通过对左右端点的独立操作得以实现。EWB被提议用于衡量在线段两端的相对注意力分配情况。研究发现了预期的向左偏差（假性忽视），EWB的效应量（两个环节均为 -0.34）大于DBE（环节1为 -0.22，环节2为 -0.14）。虽然EWB可靠性略低于DBE，但它对假性忽视更敏感，并且端点加权方法还有其他优势，包括可选择额外测量非偏侧化注意力。相当一部分参与者在遵循地标任务的指示时遇到困难，这凸显了该任务需要清晰的指示和表现检查。本研究表明，线段二等分可用于在线测量假性忽视，并为建议该任务应常规包含对左右端点的独立操作提供了依据，以便能够进行端点加权分析。
