左侧空间忽略患者关联性注意捕捉效应的研究

目的:探讨脑损伤后致左侧空间忽略患者的注意捕捉效应。方法:本研究对右侧大脑半球损伤伴左侧忽略的患者及健康被试各20例,分别进行神经心理学背景测试及关联性注意捕捉效应测试,观察左侧空间忽略患者与健康被试之间注意捕捉效应的差异,分析影响关联性注意捕捉效应强度的因素。结果:①与健康对照组相比,左侧空间忽略组的数字捕捉正确率明显降低(P<0.01)。②健康对照组:无论干扰刺激颜色与目标刺激颜色是否一致,左侧视野出现干扰刺激时的数字捕捉正确率均明显低于右侧视野出现干扰刺激时(P<0.01);无论干扰刺激在目标刺激的左侧或右侧,当干扰刺激颜色与目标刺激颜色一致时,数字捕捉正确率低于干扰刺激颜色与目标刺激颜色不一致时(P<0.01,0.05)。③左侧空间忽略组:无论干扰刺激颜色与目标刺激颜色是否一致,右侧视野出现干扰刺激时的数字捕捉正确率均低于左侧视野出现干扰刺激时(P<0.05);左侧视野出现的干扰刺激颜色与目标刺激颜色一致或不一致时,对数字捕捉正确率的影响差异无统计学意义,而右侧视野出现的干扰刺激颜色与目标刺激颜色一致时,数字捕捉正确率低于颜色不一致时(P<0.05)。结论:左侧空间忽略患者的注意功能下降,但无论对于健康受试者或者左侧空间忽略患者,符合目标刺激颜色特征的干扰刺激均能够增强非随意性地注意捕捉效应。

Contingent Capture of Attention in Patients with Left Unilateral Spatial Neglect

Objective:To explore the contingent capture of attention in patients with left unilateral spatial neglect. Methods: A total of 20 patients with left unilateral spatial neglect due to right hemisphere damage and 20 matched healthy controls were studied. All subjects completed neuropsychological background test and the contingent capture of attention test. We observed the difference in attentional capture effect between patients with left unilateral spatial neglect and healthy subjects, and analyzed the factors influencing the intensity of contingent capture of attention. Results: (1) As ccompared with the healthy controls, the accuracy rate of digital capture of the patients with left unilateral spatial neglect was significantly reduced (P<0.01). (2) In the healthy control group, whether or not the color of the distractor stimulus matches the color of the targets, distractor stimulus in the left visual field could elicit lower accuracy rate of digital capture than distractor stimulus in the right visual field (P<0.01). Whether the distractor stimulus was on the left or right visual field, the accuracy rate of digital capture was lower in the color of distractor stimulus being consistent with the targets than being inconsistent (P<0.01, P<0.05). (3) In the left unilateral spatial neglect group, whether or not the color of the distractor stimulus matches the color of the targets, distractor stimulus in the right visual field could elicit lower accuracy rate of digital capture than distractor stimulus in the left visual field (P<0.05). Whether or not the color of the distractor stimulus in the left visual field was consistent with the color of the targets, the difference in the accuracy rate of digital capture was not statistically significant. When the color of the distractor stimulus in the right visual field was consistent with the targets, the accuracy rate of digital capture was lower than inconsistent (P<0.05). Conclusion: The attentional capture effect in patients with left unilateral spatial neglect decreased. Nevertheless, the distractor stimulus matched target stimulation in color produced larger involuntary attentioanl capture effect in both patients with left unilateral spatial neglect and healthy controls.