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首页> 外文期刊>Journal of Cognitive Neuroscience >On Why Left Events are the Right Ones: Neural Mechanisms Underlying the Left-hemifield Advantage in Rapid Serial Visual Presentation
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On Why Left Events are the Right Ones: Neural Mechanisms Underlying the Left-hemifield Advantage in Rapid Serial Visual Presentation

机译：关于为什么左事件为右事件：快速串行视觉演示中左半场优势背后的神经机制

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摘要

When simultaneous series of stimuli are rapidly presented left and right, containing two target stimuli T1 and T2, T2 is much better identified when presented in the left than in the right hemifield. Here, this effect was replicated, even when shifts of gaze were controlled, and was only partially compensated when Tl side provided the cue where to expect T2. Electrophysiological measurement revealed earlier latencies of Tl- and T2-evoked N2_(pc) peaks at the right than at the left visual cortex, and larger right-hemisphere T2-evoked N2_(pc) amplitudes when T2 closely followed Tl. These findings suggest that the right hemisphere was better able to sin-rngle out the targets in time. Further, sustained contralateral slow shifts remained active after Tl for longer time at the right than at the left visual cortex, and developed more consistently at the right visual cortex when expecting T2 on the contralateral side. These findings might reflect better capacity of right-hemisphere visual working memory. These findings about the neurophysiological underpinnings of the large right-hemisphere advantage in this complex visual task might help elucidating the mechanisms responsible for the severe disturbance of hemineglect following damage to the right hemisphere.
机译：当左右同时出现一系列刺激（包含两个目标刺激T1和T2）时，在左侧和右侧半场呈现T2时会更好地识别T2。在此，即使当控制了视线移动时，也重复了该效果，并且当T1侧提供了预期T2的提示时，该效果仅得到部分补偿。电生理学测量显示，右侧的T1和T2诱发的N2_（pc）峰值比左侧视觉皮层的潜伏期更早，并且当T2紧随T1时，右半球的T2诱发的N2_（pc）振幅更大。这些发现表明，右半球更容易及时发现目标。此外，持续的对侧缓慢移位在T1之后在右侧比在左侧视觉皮层处保持更长的时间，并且在预期对侧上的T2时在右侧视觉皮层处更加一致地发展。这些发现可能反映了右半球视觉工作记忆的更好能力。这些关于右半球在此复杂的视觉任务中具有优势的神经生理基础的发现可能有助于阐明造成右半球受损后严重偏头痛的机制。

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