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首页> 外文期刊>The European Journal of Neuroscience >Induced visual illusions and gamma oscillations in human primary visual cortex.
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Induced visual illusions and gamma oscillations in human primary visual cortex.

机译：在人类初级视觉皮层中引起视觉错觉和伽玛振动。

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Abstract Using magnetoencephalography, we studied the spatiotemporal properties of cortical responses in terms of event-related synchronization and event-related desynchronization to a range of stripe patterns in subjects with no neurological disorders. These stripes are known for their tendency to induce a range of abnormal sensations, such as illusions, nausea, dizziness, headache and attacks of pattern-sensitive epilepsy. The optimal stimulus must have specific physical properties, and maximum abnormalities occur at specific spatial frequency and contrast. Despite individual differences in the severity of discomfort experienced, psychophysical studies have shown that most observers experience some degree of visual anomaly on viewing such patterns. In a separate experiment, subjects reported the incidence of illusions and discomfort to each pattern. We found maximal cortical power in the gamma range (30-60 Hz) confined to the region of the primary visual cortex in response to patterns of 2-4 cycles per degree, peaking at 3 cycles per degree. This coincides with the peak of mean illusions and discomfort, also maximal for patterns of 2-4 cycles per degree. We show that gamma band activity in V1 is a narrow band function of spatial frequency. We hypothesize that the intrinsic properties of gamma oscillations may underlie visual discomfort and play a role in the onset of seizures.
机译：摘要利用脑磁图技术，在没有神经系统疾病的受试者中，通过事件相关的同步和事件相关的去同步化，对一系列条纹模式研究了皮质反应的时空特性。这些条纹以其引起一系列异常感觉的趋势而著称，例如幻觉，恶心，头晕，头痛和对模式敏感的癫痫发作。最佳刺激必须具有特定的物理特性，并且最大的异常发生在特定的空间频率和对比度下。尽管经历的不适严重程度存在个体差异，但心理物理研究表明，大多数观察者在观看这种模式时会遇到某种程度的视觉异常。在一个单独的实验中，受试者报告了每种模式的错觉和不适发生率。我们发现，响应于每度2-4个周期的模式，最大伽马范围（30-60 Hz）限制在主要视觉皮层的区域，在每度3个周期达到峰值。这与平均错觉和不适的峰值一致，对于每度2-4个周期的模式也最大。我们表明，V1中的伽玛带活动是空间频率的窄带函数。我们假设伽玛振荡的内在特性可能是视觉不适的基础，并在癫痫发​​作中起作用。

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