Performance consistency of normal observers in forced-choice tachistoscopic visual line bisection
Performance consistency of normal observers in forced-choice tachistoscopic visual line bisection
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DOI：
10.1016/s0028-3932(01)00044-6
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发表时间：
2001-01-01
期刊：
影响因子：
2.6
通讯作者：
McCourt, ME
中科院分区：
文献类型：
--
作者：
McCourt, ME
假性忽略 (PN) 是指正常观察者在线平分任务中表现出的向左误差 (Bowers 和 Heilman, Neuropsychologia, 18, (1980) 491-8)。尽管对文献的全面回顾表明 PN 相对稳健（Jewell 和 McCourt，Neuropsychologia，38，(2000) 93-110），但关于该现象的可靠性仍存在争议，一些研究报告正常受试者右二分错误的发生率相对较高。本实验评估了正常年轻观察者的平分表现的一致性。惯用右手的受试者（N = 22）参加了速视镜强制选择线平分任务。每个受试者参加 7-16 次实验，间隔至少 24 小时（总平分测量 = 317）。因此，可以根据受试者内变异性测量来评估个体二分性能。眼球追踪器记录了一次任务期间的注视位置。获得高度显着的平均组平分误差 - 0.26 度（P < 0.001）（左负值），个体受试者平均值范围为 - 0.55 度至 + 0.03 度。在 317 个总平分测量中，9% (28) 向右偏离。 91% (20/22) 的受试者出现显着 (P < 0.05) 的平均左向误差。两名受试者的平均二分误差与零没有显着差异。没有受试者有明显的右倾错误。与屏幕（和线）中心的平均注视偏差范围为 +/- 0.9 度，并且与二分误差呈正相关（P < 0.05）。结论：强制选择速视线平分测量方法可靠性高；基于 15 次试验的平均误差与根据仅两次试验的随机样本估计的平均值之间存在 + 0.87 的平均相关性。因此，正常右手受试者群体中真正的右二分误差的发生率估计低于 5%，(C) 2001 Elsevier Science Ltd。保留所有权利。
Pseudoneglect (PN) refers to the leftward error exhibited by normal observers on line bisection tasks (Bowers and Heilman, Neuropsychologia, 18, (1980) 491-8). Although a thorough review of the literature has shown PN to be relatively robust (Jewell and McCourt, Neuropsychologia, 38, (2000) 93-110), controversy remains concerning the reliability of the phenomenon, with some studies reporting a relatively high incidence of normal subjects with rightward bisection errors. The present experiment assesses the consistency of bisection performance in normal young observers. Right-handed subjects (N = 22) participated in a tachistoscopic forced-choice line bisection task. Each subject participated in 7-16 experimental sessions separated by at least 24 h (total bisection measurements = 317). Individual bisection performance could thus be evaluated with respect to within-subject variability measures. An eyetracker recorded gaze position during the task in one session. A highly significant mean group bisection error of - 0.26 degrees (P < 0.001) was obtained (left negative), and individual subject means ranged from - 0.55 degrees to + 0.03 degrees. Of the 317 total bisection measurements, 9% (28) deviated rightward. Significant (P < 0.05) mean leftward errors occurred in 91% (20/22) of subjects. Mean bisection error in two subjects was not significantly different from zero. No subject possessed a significant rightward error. Mean gaze deviation from screen (and line) center ranged from +/- 0.9 degrees, and was positively correlated (P < 0.05) with bisection error. It is Concluded that forced-choice tachistoscopic line bisection measures are highly reliable; a mean correlation of + 0.87 exists between mean error based on 15 trials and means estimated from a random sample of only two trials. The incidence of true rightward bisection error in the population of normal right-handed subjects is thus estimated to be less than 5%, (C) 2001 Elsevier Science Ltd. All rights reserved.