Electrophysiological correlates of perceptual reversals for three different types of multistable images
Electrophysiological correlates of perceptual reversals for three different types of multistable images
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DOI：
10.1167/7.1.6
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发表时间：
2007-01-01
影响因子：
1.8
通讯作者：
Davis, Trevor J. R.
中科院分区：
文献类型：
--
作者：
Pitts, Michael A.;Nerger, Janice L.;Davis, Trevor J. R.
对21名观察者进行了电生理记录，以调查在三种不同的多稳态图形的知觉颠倒过程中，特征成分(P1，N1，选择负性[SN])是否会显示出差异。使用Necker立方体的晶格作为刺激，J.Kornmeier和M.Bach(2004,2005)报告了刺激后200-400ms的P1幅度以及广泛的与反转相关的负波的差异。目前的研究调查了Necker立方体反转的这些事件相关电位是否代表了一般的“知觉转换”机制，因此是否适用于其他类型的多稳态图形。使用了三种不同类型的多稳态刺激：改良的鲁宾的脸/花瓶、改良的施罗德阶梯和一种新的自然刺激--莱莫猎豹。结果显示，脸部/花瓶和可逆楼梯的反转相关负波广泛存在，而猎豹则不然。该组件在极性、潜伏期和头皮地形方面与SN相当。通过对枕叶P1和N1成分的分析，揭示了早期视觉空间注意对图形翻转的影响。在观察者报告知觉反转的试验中，与面孔/花瓶和可逆楼梯刺激没有反转的试验相比，P1、N1或两者都得到了增强。这些结果支持多稳态知觉模型，在该模型中，早期空间注意的变化(由P1和N1增强表示)调制知觉反转(由反转负性或SN表示)。
Electrophysiological recordings were made in 21 observers to investigate whether differences in signature components (P1, N1, selection negativity [SN]) would be revealed during perceptual reversals of three different multistable figures. Using a lattice of Necker cubes as a stimulus, J. Kornmeier and M. Bach (2004, 2005) reported differences in P1 amplitudes as well a broad reversal-related negativity occurring 200-400 ms poststimulus. The current study investigated whether these eventrelated potentials of Necker cube reversals represent general "perceptual switching'' mechanisms and would, therefore, be common to other types of multistable figures. Three different types of multistable stimuli were utilized: a modified Rubin's face/vase, a modified Schroder's staircase, and a novel natural stimulus, Lemmo's cheetahs. Results revealed the broad reversal-related negativity for the face/vase and the reversible staircase but not for the cheetahs. This component is comparable to the SN in polarity, latency, and scalp topography. An effect of early visual spatial attention on figure reversals was suggested by an analysis of the occipital P1 and N1 components. The P1, N1, or both were enhanced for trials in which the observer reported perceptual reversals compared with trials in which no reversals were reported for the face/vase and reversible staircase stimuli. These results support a model of multistable perception in which changes in early spatial attention ( indicated by P1 and N1 enhancement) modulate perceptual reversals ( indicated by the reversal negativity or SN).