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首页> 外文期刊>Neuropsychologia >Emotionally negative stimuli can overcome attentional deficits in patients with visuo-spatial hemineglect.
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Emotionally negative stimuli can overcome attentional deficits in patients with visuo-spatial hemineglect.

机译：情绪消极刺激可以克服视觉空间偏向患者的注意力缺陷。

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摘要

Left unilateral spatial neglect resulting from right brain damage is characterized by loss of awareness for stimuli in the contralesional side of space, despite intact visual pathways. We examined using fMRI whether patients with neglect are more likely to consciously detect in the neglected hemifield, emotionally negative complex scenes rather than visually similar neutral pictures and if so, what neural mechanisms mediate this effect. Photographs of emotional and neutral scenes taken from the IAPS were presented in a divided visual field paradigm. As expected, the detection rate for emotional stimuli presented in the neglected field was higher than for neutral ones. Successful detection of emotional scenes as opposed to neutral stimuli in the left visual field (LVF) produced activations in the parahippocampal and anterior cingulate areas in the right hemisphere. Detection of emotional stimuli presented in the intact right visual field (RVF) activated a distributed network of structures in the left hemisphere, including anterior and posterior cingulate cortex, insula, as well as visual striate and extrastriate areas. LVF-RVF contrasts for emotional stimuli revealed activations in right and left attention related prefrontal areas whereas RVF-LVF comparison showed activations in the posterior cingulate and extrastriate visual cortex in the left hemisphere. An additional analysis contrasting detected vs. undetected emotional LVF stimuli showed involvement of left anterior cingulate, right frontal and extrastriate areas. We hypothesize that beneficial role of emotion in overcoming neglect is achieved by activation of frontal and limbic lobe networks, which provide a privileged access of emotional stimuli to attention by top-down modulation of processing in the higher-order extrastriate visual areas. Our results point to the importance of top-down regulatory role of the frontal attentional systems, which might enhance visual activations and lead to greater salience of emotional stimuli for perceptual awareness.
机译：尽管视觉通路完整，但右脑损伤所致的左单侧空间忽视的特征是失去了空间对侧侧对刺激的意识。我们使用功能磁共振成像检查了被忽视的患者是否更有可能在被忽视的半场，情绪消极的复杂场景中而不是在视觉上类似的中性图片上有意识地发现，如果是，是什么神经机制介导了这种效果。 IAPS拍摄的情感和中性场景的照片以分开的视野范例呈现。不出所料，在被忽视的领域中出现的情绪刺激的检出率要高于中性。与左视野（LVF）中的中性刺激相反，情感场景的成功检测在右半球的海马旁和前扣带回区域产生了激活。完整的右视野（RVF）中呈现的情绪刺激的检测激活了左半球的分布式结构网络，包括前扣带回和后扣带回皮层，岛状以及视觉纹状体和纹状体区域。 LVF-RVF的情绪刺激对比显示右和左注意力相关的前额叶区域被激活，而RVF-LVF的比较显示左扣球后扣带和视神经皮层被激活。另一项分析对比了检测到的LVF和未检测到的情绪LVF刺激，结果显示左前扣带，右额叶和外条纹区域受累。我们假设情绪的克服在疏忽中的有益作用是通过额叶和边缘叶网络的激活来实现的，该网络通过自上而下的调制在较高阶的外在视觉区域中进行处理，从而提供了对注意力的情感刺激的特权访问。我们的研究结果表明了正面注意系统自上而下的调节作用的重要性，这可能会增强视觉激活并导致对感知觉的情感刺激更加显着。

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