Investigating the Characteristics of Covert Unilateral Spatial Neglect Using the Modified Posner Task: A Single-subject Design Study.
Investigating the Characteristics of Covert Unilateral Spatial Neglect Using the Modified Posner Task: A Single-subject Design Study.
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用改进的Posner任务研究外显单侧空间忽视的特点：一项单被试设计研究。
DOI：
10.2490/prm.20210014
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Yoshihiro N
中科院分区：
文献类型：
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作者：
Osaki S;Amimoto K;Miyazaki Y;Tanabe J;Yoshihiro N
基于纸笔测试被确定为单侧空间忽略（USN）无症状的患者在行走时经常与左侧的物体发生碰撞。本研究旨在调查行走时发生碰撞的受试者的慢性USN。两名慢性USN患者在行走时发生碰撞，使用行为疏忽测试-常规（BIT-C）进行评估。此外，使用改良Posner任务（MPT）来评估左和右反应时。MPT目标随机出现在提示所指示的一侧（有效条件）或相反一侧（无效条件）。本研究采用交替治疗单病例设计。MPT的有效和无效条件快速随机交替，以确定反应时间的差异。统计学分析使用单侧随机化检验比较左和右反应时间，以研究有效和无效条件。两名受试者的总BIT-c评分均在正常范围内，而对于无效条件，左侧MPT反应时间高于右侧。然而，对于有效条件，只有情况B的左侧反应时间增加。MPT的有效条件评估自愿注意，而无效条件评估注意的重新定位。因此，对于案例A，观察到注意缺陷的左重定向，而对于案例B，观察到左随意注意和注意缺陷的左重定向。MPT结果揭示了内隐忽视体征的特征。USN评估将受益于使用MPT的额外研究。
Patients identified as asymptomatic for unilateral spatial neglect (USN) based on paper-and-pen tests nonetheless often collide with objects to their left while walking. This study aimed to investigate chronic USN in subjects who experienced collisions while walking. Two patients with chronic USN who experienced collisions while walking were evaluated using the Behavioral Inattention Test-conventional (BIT-c). Additionally, the modified Posner task (MPT) was used to evaluate the left and right reaction times. MPT targets randomly appeared either on the side indicated by the cue (valid condition) or on the opposite side (invalid condition). This study used an alternating treatments single-case design. The valid and invalid conditions of the MPT alternated rapidly and randomly to determine differences in reaction time. Statistical analysis compared left and right reaction times using a one-tailed randomization test to study valid and invalid conditions. The total BIT-c score was in the normal range for both subjects, whereas MPT reaction times were higher on the left side than on the right side for the invalid condition. However, for the valid condition, only Case B had increased reaction times on the left side. The MPT valid condition evaluates voluntary attention, whereas the invalid condition evaluates the reorientation of attention. Consequently, for Case A, a left reorientation of attention deficit was observed, whereas, for Case B, left voluntary attention and left reorientation of attention deficits were observed. The MPT results revealed the characteristics of covert neglect signs. USN evaluation would benefit from additional research using MPT.