Full-field input generated from right visual field information for healthy participants reproduces performance simulating left unilateral spatial neglect in line bisection

IF 2 4区 心理学 Q2 PSYCHOLOGY
Keita Nukui, Sumio Ishiai
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引用次数: 0

Abstract

Patients with left unilateral spatial neglect (USN) typically place the subjective midpoint to the right of the objective centre when bisecting a horizontal line. This pathological phenomenon may be explained as a result of greater dependence on the right endpoint in the external reference frame (Koyama et al., Brain Cogn, 35, 1997, 271; McIntosh et al., Cogn Brain Res, 25, 2005, 833). Ishiai et al. (Brain, 112, 1989, 1485) reported that once patients with USN fixated on a certain point on the right part of the presented line, they persisted with this point and marked the subjective midpoint there without leftward searches. Ishiai et al.'s interpretation was that the patients saw a totalised line representation that extended equidistantly to the right and left sides, based on the information of the attended rightward extent from the subjective midpoint. Accordingly, we used virtual reality goggles (VRG) and devised a mirror-image viewing (MV) condition that showed a full-field view based on the right visual field information to test whether healthy participants would thereby show neglect-like bisection performance. The participants were 30 healthy adults (22–37 years old; 15 women and 15 men). In this condition, 96.7% (29/30) of participants were judged to exhibit USN-like performance of line bisection, indicating the effectiveness of MV condition to simulate USN. The novelty of the present study lies in the use of a task-specific intervention of neglect-like visuospatial processing during line bisection without attempting to modify the direction of spatial attention. This approach may contribute to the understanding of the pathological visuospatial processing of USN.

健康受试者从右侧视野信息产生的全视野输入再现了在线平分中模拟左单侧空间忽视的表现
左侧单侧空间忽视(USN)患者在平分水平线时,通常将主观中点置于客观中心的右侧。这种病理现象可以解释为对外部参考框架中右终点的更大依赖(Koyama等人,Brain Cogn, 35,1997,271;McIntosh et al.,脑科学学报,2005,33(3)。Ishiai等人(Brain, 11,1989,1485)报道,一旦USN患者盯着呈现线右侧的某一点,他们就会一直盯着这个点,并在那里标记主观中点,而不会向左搜索。Ishiai等人的解释是,根据主观中点向右延伸的信息,患者看到了一个向左右两边等距延伸的总线表征。因此,我们使用虚拟现实护目镜(VRG)并设计了一个镜像观看(MV)条件,该条件显示了基于正确视野信息的全景视图,以测试健康参与者是否会因此表现出类似忽略的对分性能。参与者为30名健康成人(22-37岁;15名女性和15名男性)。在此条件下,96.7%(29/30)的参与者被判断为具有类似USN的线平分性能,表明MV条件模拟USN的有效性。本研究的新颖之处在于,在不试图改变空间注意方向的情况下,在切线过程中使用了一种特定任务的忽视样视觉空间加工干预。这种方法可能有助于理解USN的病理视觉空间加工。
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来源期刊
Journal of Neuropsychology
Journal of Neuropsychology 医学-心理学
CiteScore
4.50
自引率
4.50%
发文量
34
审稿时长
>12 weeks
期刊介绍: The Journal of Neuropsychology publishes original contributions to scientific knowledge in neuropsychology including: • clinical and research studies with neurological, psychiatric and psychological patient populations in all age groups • behavioural or pharmacological treatment regimes • cognitive experimentation and neuroimaging • multidisciplinary approach embracing areas such as developmental psychology, neurology, psychiatry, physiology, endocrinology, pharmacology and imaging science The following types of paper are invited: • papers reporting original empirical investigations • theoretical papers; provided that these are sufficiently related to empirical data • review articles, which need not be exhaustive, but which should give an interpretation of the state of research in a given field and, where appropriate, identify its clinical implications • brief reports and comments • case reports • fast-track papers (included in the issue following acceptation) reaction and rebuttals (short reactions to publications in JNP followed by an invited rebuttal of the original authors) • special issues.
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