Reducing alertness does not affect line bisection bias in neurotypical participants

This is a set of .csv data files as well as R analysis code for the project stated in the title. Participants were required to bisect 32 horizontal lines of varying size and shape (see McIntosh et al., 2005; 2017) on a computer screen using their mouse. This was done with and without spatial cues (shortly displayed, red, vertical lines at one end of the horizontal line), followed by a vigilance task, followed by the line bisection task again. The vigilance task was a 50-minute task in which a horizontal line moved up and down randomly; whenever it reached a certain threshold (i.e., it crossed a static horizontal line in the top half of the screen), participants were meant to push the space bar as quickly as possible. On average, participants' reaction times decreased over the vigilance task, suggesting a reduction in alertness. Similarly, for about half the sample this reduction was also indicated by the Stanford Sleepiness Scale. For the other half of the sample, no such data could be used, as the Stanford Sleepiness Scale was translated incorrectly. While the reduction in alertness did not have an effect on a measure of spatial attention (endpoint weightings bias, EWB), it did show an effect on a measure of general attention, endpoint weightings sum (EWS). McInt_Vig_04-20.csv and McInt_Vig_cue_04-20.csv contain, for each participant, all bisection measures derived without cues and with cues, respectively. McInt_Vig_vig.csv contains the reaction times of participants to the vigilance task.

Edit: Added raw data

本数据集包含一系列以.csv格式存储的数据文件以及对应于标题所述项目的R语言分析代码。参与者被要求在计算机屏幕上使用鼠标将32条形状和尺寸各异的水平线进行二分，具体操作方法可参考McIntosh等人的研究（2005年；2017年）。该任务分别在有无空间线索（在水平线一端短暂显示的红色垂直线）的情况下进行，随后进行一项警觉性测试，再次进行线段二分任务。警觉性测试是一项时长50分钟的测试，其中一条水平线随机上下移动；每当该线达到特定阈值（即，穿过屏幕上半部分静态水平线）时，参与者需尽可能快速地按下空格键。平均而言，参与者在警觉性测试中的反应时间有所下降，这表明警觉性有所降低。类似地，对于约一半的样本，Stanford睡眠量表也显示出警觉性降低的迹象。对于另一半样本，由于Stanford睡眠量表翻译不准确，无法使用此类数据。尽管警觉性的降低对空间注意力测量（端点权重偏差，EWB）没有影响，但它对一般注意力测量（端点权重总和，EWS）产生了显著影响。McInt_Vig_04-20.csv和McInt_Vig_cue_04-20.csv文件包含了每位参与者在有无线索的情况下得出的所有二分测量结果。McInt_Vig_vig.csv文件包含了参与者在警觉性测试中的反应时间数据。