Busch Niko A, Herrmann Christoph S, Müller Matthias M, Lenz Daniel, Gruber Thomas
Institute of Psychology, Department of Biological Psychology, Otto-von-Guericke-University of Magdeburg, PO Box 4120, 39108 Magdeburg, Germany.
Neuroimage. 2006 Dec;33(4):1169-77. doi: 10.1016/j.neuroimage.2006.07.034. Epub 2006 Oct 4.
This study proposes a standard paradigm for the investigation of visual information processing by means of gamma activity and presents a novel set of stimuli with a broad range of complex, coloured familiar real world and unfamiliar nonsense objects which are well matched with respect to physical stimulus properties. In order to demonstrate that the paradigm and stimulus set yield reliable results both were employed in two electrophysiological investigations in two independent laboratories. Participants were required to discriminate familiar from unfamiliar stimuli. The pattern of results was very consistent across laboratories. Early event-related potentials were not influenced by the stimulus type suggesting that physical stimulus properties did not confound object familiarity. Induced gamma band activity was stronger for familiar than for unfamiliar objects, supporting the notion of gamma activity as a signature of cortical networks underlying object representations.
本研究提出了一种通过伽马活动来研究视觉信息处理的标准范式，并呈现了一组新颖的刺激物，其中包括一系列复杂的、有颜色的、熟悉的现实世界物体和不熟悉的无意义物体，这些物体在物理刺激属性方面匹配良好。为了证明该范式和刺激集能产生可靠的结果，二者都被用于两个独立实验室的两项电生理研究中。参与者被要求区分熟悉和不熟悉的刺激物。不同实验室的结果模式非常一致。早期事件相关电位不受刺激类型的影响，这表明物理刺激属性并未混淆物体的熟悉度。对于熟悉物体，诱发的伽马波段活动比不熟悉物体更强，这支持了伽马活动是物体表征背后皮层网络标志的观点。
