Ishizu Tomohiro, Zeki Semir
Wellcome Laboratory of Neurobiology and Wellcome Department of Imaging Neuroscience, University College London, Gower Street, London WC1E 6BT, United Kingdom.
Neuroimage. 2014 May 1;91(100):203-9. doi: 10.1016/j.neuroimage.2014.01.040. Epub 2014 Jan 29.
We report experiments designed to learn whether different kinds of perceptually unstable visual images engage different neural mechanisms. 21 subjects viewed two types of bi-stable images while we scanned the activity in their brains with functional magnetic resonance imaging (fMRI); in one (intra-categorical type) the two percepts remained within the same category (e.g. face-face) while in the other (cross-categorical type) they crossed categorical boundaries (e.g. face-body). The results showed that cross- and intra-categorical reversals share a common reversal-related neural circuitry, which includes fronto-parietal cortex and primary visual cortex (area V1). Cross-categorical reversals alone engaged additional areas, notably anterior cingulate cortex and superior temporal gyrus, which have been posited to be involved in conflict resolution.
我们报告了旨在了解不同类型的感知不稳定视觉图像是否会激活不同神经机制的实验。21名受试者观看了两种类型的双稳态图像，同时我们使用功能磁共振成像（fMRI）扫描他们大脑中的活动；在一种类型（类别内型）中，两种感知保持在同一类别内（例如脸-脸），而在另一种类型（跨类别型）中，它们跨越了类别边界（例如脸-身体）。结果表明，跨类别和类别内的反转共享一个与反转相关的共同神经回路，其中包括额顶叶皮层和初级视觉皮层（V1区）。仅跨类别反转还激活了其他区域，特别是前扣带回皮层和颞上回，这些区域被认为与冲突解决有关。
