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Long-lasting effects of a gaze-contingent intervention on change detection in healthy participants – implications for neglect rehabilitation
Cortex ( IF 3.6 ) Pub Date : 2020-11-05 , DOI: 10.1016/j.cortex.2020.10.013
Karin Ludwig 1 , Thomas Schenk 1
Affiliation  

Patients with spatial neglect show an ipsilesional exploration bias. We developed a gaze-contingent intervention that aims at reducing this bias and tested its effects on visual exploration in healthy participants: During a visual search, stimuli in one half of the search display are removed when the gaze moves into this half. This leads to a relative increase in the exploration of the other half of the search display – the one that can be explored without impediments. In the first experiment, we tested whether this effect transferred to visual exploration during a change detection task (under change blindness conditions), which was the case. In a second experiment, we modified the intervention (to an intermittent application) but the original version yielded more promising results. Thus, in the third experiment, the original version was used to test the longevity of its effects and whether its repeated application produced even stronger results. To this aim, we compared two groups: the first group received the intervention once, the second group repeatedly on three consecutive days. The change detection task was administered before the intervention and at four points in time after the last intervention (directly afterwards, + 1 hour, + 1 day, and + 4 days). The results showed long-lasting effects of the intervention, most pronounced in the second group. Here the intervention changed the bias in the visual exploration pattern significantly until the last follow-up. We conclude that the intervention shows promise for the successful application in neglect patients.



中文翻译:

凝视或偶然干预对健康参与者的变化检测的长期影响–对忽视康复的影响

空间忽视的患者表现出同侧探查偏倚。我们开发了一种视线偶然的干预措施,旨在减少这种偏见,并测试了其对健康参与者的视觉探索的影响:在视觉搜索过程中,当视线移至另一半时,搜索显示的一半就会被消除。这导致对搜索显示另一半的探索相对增加-可以无障碍地进行探索。在第一个实验中,我们测试了这种影响是否在更改检测任务期间(在更改盲目条件下)转移到了视觉探索中。在第二个实验中,我们修改了干预措施(适用于间歇性应用程序),但原始版本产生了更可喜的结果。因此,在第三个实验中 原始版本用于测试其效果的寿命,以及重复使用是否产生更强的效果。为此,我们比较了两组:第一组接受一次干预,第二组连续三天重复。在干预之前和最后干预之后的四个时间点(直接之后,+ 1小时,+ 1天和+ 4天)执行更改检测任务。结果显示干预效果持久,在第二组中最为明显。在这里,干预措施显着改变了视觉探索模式的偏差,直到最后一次随访为止。我们得出的结论是,该干预措施显示了在疏忽患者中成功应用的希望。

更新日期:2020-11-05
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