Śmigasiewicz Kamila, Liebrand Matthias, Landmesser Johannes, Verleger Rolf
Dept. of Neurology, University of Lübeck, Germany.
Dept. of Neurology, University of Lübeck, Germany.
Neuropsychologia. 2017 Jun;100:155-163. doi: 10.1016/j.neuropsychologia.2017.04.030. Epub 2017 Apr 26.
Stimulus-driven orienting of visual attention is lateralized to the right hemisphere (RH). This lateralization has been studied in the dual-stream rapid serial visual presentation task (dual RSVP). In this task a second target (T2), hard to discern by being embedded in one of two lateral streams of rapidly changing distractors, is better identified on the left than on the right. This phenomenon is called the left visual field advantage (LVFA). Furthermore, in terms of event related potentials (ERPs), the N2pc component and visual evoked potentials (VEPs) are evoked earlier at the RH than at the left hemisphere (LH). All previous dual RSVP experiments were performed on right-handers. In the present study it was investigated how the LVFA and its neural correlates are modulated by handedness. To that end, the size of the LVFA and ERPs (VEPs and N2pc) were compared between right- and left-handers. VEPs were evoked earlier at the RH than the LH in right-handers but not in left-handers. Besides this effect, handedness modulated neither the size of the LVFA nor T2-evoked N2pc. Thus, the LVFA seems to be independent of handedness. Rather than for lateralization of attention, handedness might be relevant for lateralization of early visual perception processes.
视觉注意的刺激驱动定向偏向于右脑半球（RH）。这种偏向性已在双流快速序列视觉呈现任务（双流RSVP）中得到研究。在该任务中，第二个目标（T2）嵌入在两个快速变化的干扰物的横向流之一中，难以辨别，在左侧比在右侧能更好地被识别。这种现象被称为左视野优势（LVFA）。此外，就事件相关电位（ERP）而言，N2pc成分和视觉诱发电位（VEP）在右脑半球比在左脑半球（LH）更早被诱发。之前所有的双流RSVP实验都是在右利手个体上进行的。在本研究中，探讨了利手如何调节LVFA及其神经关联。为此，比较了右利手和左利手个体之间LVFA的大小以及ERP（VEP和N2pc）。在右利手个体中，VEP在右脑半球比在左脑半球更早被诱发，但在左利手个体中并非如此。除了这种效应外，利手既没有调节LVFA的大小，也没有调节T2诱发的N2pc。因此，LVFA似乎与利手无关。利手可能与早期视觉感知过程的偏向性有关，而不是与注意力的偏向性有关。
