Emerson Rebeca Lauren, García-Molina Alberto, López Carballo Jaume, García Fernández Juan, Aparicio-López Celeste, Novo Junquera, Sánchez-Carrión Rocío, Enseñat-Cantallops Antonia, Peña-Casanova Jordi
a Àrea de Rehabilitació NeuroPiscoSocial, Institut Guttmann, Institut Universitari de Neurorehabilitació adscrit a la UAB , Barcelona , Spain.
b Universitat Autònoma de Barcelona , Barcelona , Bellaterra , Spain.
Appl Neuropsychol Adult. 2019 Sep-Oct;26(5):401-410. doi: 10.1080/23279095.2018.1434522. Epub 2018 Feb 22.
The objective of this study was to examine visual scanning performance in patients with Unilateral Spatial Neglect (USN) in a visual search task. Thirty-one right hemisphere stroke patients with USN were recruited. They performed a dynamic visual search task with two conditions, with and without distractors, while eye movements were monitored with an eye-tracker. The main goal of the task was to select target stimuli that appeared from the top of the screen and moved vertically downward. Target detection and visual scanning percentage were assessed over two hemispaces (right, left) on two conditions (distractor, no distractor). Most Scanned Regions (MSR) were calculated to analyze the areas of the screen where most points of fixation were directed to. Higher target detection rate and visual scanning percentages were found on the right hemispace on both conditions. From the MSRs we found that participants with a center of attention further to the right of the screen also presented smaller overall MSRs. Right hemisphere stroke patients with USN presented not only a significant rightward bias but reduced overall search areas, implying hyperattention does not only restrict search on the horizontal (right-left) axis but the vertical axis (top-bottom) too.
本研究的目的是在视觉搜索任务中检查单侧空间忽视（USN）患者的视觉扫描表现。招募了31名患有USN的右半球中风患者。他们在有和没有干扰物的两种条件下执行动态视觉搜索任务，同时用眼动仪监测眼动。该任务的主要目标是选择从屏幕顶部出现并垂直向下移动的目标刺激。在两种条件下（有干扰物、无干扰物），在两个半空间（右侧、左侧）评估目标检测和视觉扫描百分比。计算最常扫描区域（MSR）以分析屏幕上大多数注视点指向的区域。在两种条件下，右侧半空间的目标检测率和视觉扫描百分比都更高。从MSR中我们发现，注意力中心更偏向屏幕右侧的参与者的整体MSR也更小。患有USN的右半球中风患者不仅表现出明显的向右偏向，而且整体搜索区域减小，这意味着过度注意力不仅限制了在水平（右-左）轴上的搜索，也限制了在垂直轴（上-下）上的搜索。
