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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Neural interactions between flicker-induced self-organized visual hallucinations and physical stimuli
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Neural interactions between flicker-induced self-organized visual hallucinations and physical stimuli

机译：闪烁诱导的自组织视觉幻觉与身体刺激之间的神经相互作用

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摘要

Spontaneous pattern formation in cortical activity may have consequences for perception, but little is known about interactions between sensory-driven and self-organized cortical activity. To address this deficit, we explored the relationship between ordinary stimulus-controlled pattern perception and the autonomous hallucinatory geometrical pattern formation that occurs for unstructured visual stimulation (e.g., empty-field flicker). We found that flicker-induced hallucinations are biased by the presentation of adjacent geometrical stimuli; geometrical forms that map to cortical area V1 as orthogonal gratings are perceptually opponent in biasing hallucinations. Rotating fan blades and pulsating circular patterns are the most salient biased hallucinations. Apparent motion and fractal (1/f) noise are also effective in driving hallucinatory pattern formation (the latter is consistent with predictions of spatiotemporal pattern formation driven by stochastic resonance). The behavior of these percepts suggests that self-organized hallucinatory pattern formation in human vision is governed by the same cortical properties of localized processing, lateral inhibition, simultaneous contrast, and nonlinear retinotopic mapping that govern ordinary vision.
机译：皮层活动中的自发模式形成可能会对感知产生影响，但是对于感觉驱动的和自组织的皮层活动之间的相互作用知之甚少。为了解决这一缺陷，我们探索了普通刺激控制模式感知与非幻觉视觉刺激（例如空视野闪烁）中发生的自主幻觉几何图案形成之间的关系。我们发现，闪烁诱导的幻觉因相邻的几何刺激的表现而有偏差。在正交幻觉上，当正交光栅映射到皮层区域V1的几何形式在感知上是相对的。旋转的风扇叶片和脉动的圆形图案是最明显的偏向幻觉。表观运动和分形（1 / f）噪声在驱动幻觉模式的形成方面也很有效（后者与随机共振驱动的时空模式形成的预测一致）。这些知觉的行为表明，人类视觉中自组织的幻觉模式的形成受支配普通视力的局部加工，侧向抑制，同时对比和非线性视网膜视点映射的皮质特性所控制。

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