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首页> 外文期刊>The European Journal of Neuroscience >Pathways involved in human conscious vision contribute to obstacle-avoidance behaviour
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Pathways involved in human conscious vision contribute to obstacle-avoidance behaviour

机译：人类意识视觉中涉及的途径有助于避障行为

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摘要

Human patients with visual field defects following damage to their primary visual cortex (V1) will often misperceive the midpoint of a horizontal line. They tend to shift the midpoint away from the real position towards their blind field. In patients with unilateral neglect, where midpoint shifts can also be observed, these perceptual errors do not lead to errors in an obstacle-avoidance task, which also requires the ability to find the midpoint between two obstacles. This dissociation in neglect patients was taken as evidence that obstacle-avoidance performance is guided by visual information from the dorsal visual stream. Recently it was shown that a patient with hemianopia could avoid an obstacle presented in his blind field. This suggests that obstacle-avoidance behaviour can be guided by subconscious vision alone involving a direct route from extrageniculate structures in the brain to dorsal stream areas. To investigate whether obstacle avoidance relies only on this subconscious route or also uses information from pathways involved in conscious vision, we examined the effect of the hemianopic shift on obstacle-avoidance behaviour. This shift is found in tasks where a conscious visual judgement is required and presumably arises in pathways underlying conscious vision (V1 and ventral stream areas). We compared the performance of six patients with left hemianopia with the performance of six patients with right hemianopia. We found a clear bias in both groups, which also affected obstacle-avoidance performance. It is thus concluded that obstacle avoidance does not bypass the system for conscious vision completely. We studied the occurrence of the hemianopic line bisection error in perceptual tasks (ventral) and visuomotor tasks (dorsal). The finding that a similar spatial bias was observed for conscious visual judgements and for obstacle avoidance performance is interpreted as evidence that the visuomotor system uses visual information from pathways involved in conscious vision.
机译：人类患者的主要视皮层（V1）受损后出现视野缺损，通常会误认为水平线的中点。他们倾向于将中点从实际位置转移到盲区。在单侧忽视的患者中，也可以观察到中点偏移，这些知觉错误不会导致避障任务中的错误，这也需要能够找到两个障碍之间的中点。疏忽患者的这种分离被视为证据，表明避障性能是由来自背侧视觉流的视觉信息指导的。最近显示，偏盲患者可以避免盲区出现障碍物。这表明，仅通过潜意识即可指导避障行为，该潜意识涉及从大脑中的外生结构到背流区域的直接路径。为了研究避障是否仅依赖于这种潜意识路径，还是使用来自有意识视觉的路径信息，我们研究了偏盲行为对偏盲行为的影响。这种转变是在需要有意识的视觉判断的任务中发现的，并且大概发生在有意识的视觉基础的通路（V1和腹侧流区域）中。我们将六名左偏盲患者的表现与六例右偏盲患者的表现进行了比较。我们发现两组都有明显的偏见，这也影响了避障性能。因此得出结论，避障并没有完全绕过有意识视觉的系统。我们研究了在感性任务（腹侧）和视觉运动任务（背侧）中半盲线平分错误的发生。对于有意识的视觉判断和避障性能观察到类似的空间偏差的发现被解释为视觉运动系统使用了与有意识的视觉相关的视觉信息的证据。

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