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首页> 外文期刊>Neuropsychologia >Does delay impair localisation in blindsight?
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Does delay impair localisation in blindsight?

机译：延迟是否会损害视力的定位？

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摘要

The unconscious sensorimotor skills which survive compromise of the geniculostriate visual pathway have been linked with activity of the dorsal stream of extrastriate occipitoparietal cortex. These sensorimotor circuits are thought to operate in real time. Therefore, an introduction of a delay between visual stimulus presentation and the patient's subsequent motor response should severely compromise sensorimotor tasks such as localisation (moving hand or eye to the location of a previously presented visual target). We tested this hypothesis in patient DB, a well-studied case of blindsight whose localisation abilities were first documented in the 1970s. Using eye tracking and hand movement recording technologies, as well as stimuli that control for light scatter, we verified the original observations of DB's manual and saccadic localisation. Remarkably, the introduction of a 4. s delay did not compromise his ability to localise with either eye or hand. A control experiment reveals that this skill does not depend on an opportunity to make a decision at the time of stimulus presentation, circumventing the delay using memory. These data suggest that DB's manual and saccadic localisation skills do not depend on the circuits of the dorsal stream, or that delay, contrary to theory, does not severely compromise dorsal sensorimotor skills.
机译：幸免于genic舌肌视觉通路折衷的无意识感觉运动技能与extra外枕顶叶皮层背流的活动有关。这些感觉运动电路被认为是实时运行的。因此，在视觉刺激表现和患者随后的运动反应之间引入延迟会严重损害感觉运动任务，例如定位（将手或眼移至先前呈现的视觉目标的位置）。我们在患者DB中验证了这一假设，DB是一个经过充分研究的盲目病例，其定位能力最早在1970年代得到了证明。使用眼动追踪和手部动作记录技术，以及控制光散射的刺激，我们验证了DB手动和声调定位的原始观察结果。值得注意的是，引入4. s延迟并不影响他用眼睛或手进行定位的能力。对照实验表明，该技能不依赖于在刺激刺激时做出决定的机会，从而避免了使用记忆的延迟。这些数据表明，DB的体力和听觉定位技能不依赖于背流回路，或者与理论相反，延迟不会严重损害背感觉运动技能。

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