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Increased attentional load moves the left to the right

机译:注意负荷增加,左移到右移

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Introduction: Unilateral brain damage can heterogeneously alter spatial processing. Very often brain-lesioned patients fail to report (neglect) items appearing within the contralesional space. Much less often patients mislocalize items' spatial position. We investigated whether a top-down attentional load manipulation (dual-tasking), known to result in contralesional omissions even in apparently unimpaired cases, might also induce spatial mislocalizations. Method: Nine right-hemisphere-damaged patients performed three computer-based tasks encompassing different levels of attentional load. The side of appearance of visual targets had to be reported either in isolation or while processing additional information (visual or auditory dual task). Spatial mislocalizations (from the contralesional hemispace towards the ipsilesional unaffected one) were then contrasted with omissions both within and across tasks, at individual as well as at group level. Results: The representation of ipsilesional targets was accurate and not affected by dual-tasking requirements. Contralesional targets were instead often omitted and, under dual-task conditions, also mislocalized by four patients. Three cases reported a significant number of left targets as appearing on the right (alloesthesia). Two of these patients perceived more targets (albeit to a wrong spatial location) under dual- than under single-task load. In a fourth patient, increased visual load resulted in synchiria, the (mis)perception of single, contralesional targets as being two (one on each side). Conclusions: When the neural circuitry subtending spatial processing is damaged, an increase in task load can lead to either a disregard or a bias in the processing of contralesional hemispace. The spatial bias subtending mislocalizations seems to index a more severe deficit than neglect, as if contralesional space would be completely erased rather than merely ignored.
机译:简介:单侧脑损伤可以异质地改变空间加工。脑损伤患者常常无法报告(忽略)在对侧空间内出现的项目。患者很少会误定位物品的空间位置。我们调查了自上而下的注意负荷操纵(双重任务)是否已知也会导致对立遗漏,即使在显然没有障碍的情况下也可能引起空间错位。方法:9名右半球受损患者执行了三项基于计算机的任务,涉及不同水平的注意力负荷。视觉目标出现的一侧必须单独报告或在处理其他信息时报告(视觉或听觉双重任务)。然后,将空间错位(从对侧半空间到同侧未受影响的区域)与任务内和任务间以及个人和小组级别的遗漏进行了对比。结果:损伤目标的表示是准确的,不受双重任务要求的影响。相反,经常忽略对抗目标,并且在双重任务条件下,四名患者也定位不正确。 3例报告称右侧出现大量左目标(感觉异常)。这些患者中有两个在双任务负荷下比在单任务负荷下感知到更多的目标(尽管空间位置错误)。在第四名患者中,视觉负荷增加导致了结膜炎,单个对侧目标的(误)感知为两个(每侧一个)。结论:当对接空间处理的神经回路受损时,任务负荷的增加会导致对侧半空间处理过程中的忽视或偏见。伴随着误定位的空间偏差似乎比忽略更为严重,表明对立空间将被完全消除而不是仅仅被忽略。

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