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首页> 外文期刊>Experimental Brain Research >Phosphene thresholds evoked by transcranial magnetic stimulation are insensitive to short-lasting variations in ambient light
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Phosphene thresholds evoked by transcranial magnetic stimulation are insensitive to short-lasting variations in ambient light

机译：经颅磁刺激诱发的磷阈值对环境光的短时变化不敏感

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摘要

Transcranial magnetic stimulation applied over the occipital pole is able to induce the perception of light flashes called phosphenes. For phosphene detection and threshold measurement subjects are usually blindfolded or investigated in the dark. The question that we posed here is whether phosphene thresholds change with variations in ambient light. In six subjects we measured thresholds under four different conditions: closed eyes (5 min adaptation) and 0.5, 100, and 3,200 cd/m2 background illumination. No systematic change in phosphene thresholds was observed with different lighting conditions. In three subjects we repeated the measurements after one week and again found similar values with no systematic modulation. Our data show that cortical excitability does not change with different light adaptation levels. This confirms that the main adaptation to light takes place at subcortical levels, namely at the retina. The practical conclusion is that it is unnecessary to blindfold subjects when determining phosphene thresholds.
机译：在枕骨上施加经颅磁刺激能够引起被称为的闪光感。对于磷检测和阈值测量，通常将受试者蒙住眼睛或在黑暗中进行调查。我们在这里提出的问题是阈值是否随环境光的变化而变化。在六个对象中，我们测量了四种不同条件下的阈值：闭眼（适应5分钟）以及0.5、100和3200 cd / m2 背景照明。在不同的照明条件下，未观察到磷阈值的系统变化。在三名受试者中，我们在一周后重复了测量，并再次发现了相似的值，没有系统的调节。我们的数据表明皮质兴奋性不会随不同的光适应水平而改变。这证实了对光的主要适应发生在皮层下水平，即在视网膜上。实际结论是，在确定determining阈值时不必蒙住对象。

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