Asanowicz Dariusz, Verleger Rolf, Kruse Lena, Beier Kathrin, Śmigasiewicz Kamila
Institute of Psychology, Jagiellonian University in Kraków, Poland; Department of Neurology, University of Lübeck, Germany.
Department of Neurology, University of Lübeck, Germany; Institute of Psychology II, University of Lübeck, Germany.
Brain Cogn. 2017 Apr;113:40-55. doi: 10.1016/j.bandc.2017.01.007. Epub 2017 Jan 21.
This study investigates hemispheric asymmetry evoked by non-target alphanumeric stimuli in a bilateral rapid serial visual presentation (RSVP) task. Our indicators of asymmetry are shorter latencies and larger amplitudes of the right hemisphere (RH) P1 and N1 components of visual evoked potentials (VEPs). This VEP asymmetry might reflect either a RH advantage, possibly in early perceptual processing, or for familiar stimuli, or for directing attention, or might be a paradoxical reflection of left hemisphere specialization in letter processing. Experiment 1 showed that the VEP asymmetry decreased, though remained present, with unfamiliar stimuli (Tibetan letters), as compared to familiar stimuli (Latin letters and Arabic digits). Experiment 2 showed that while leftward and rightward attentional biases affected the relation between hemispheres contra- and ipsilateral to attended visual fields, the VEP asymmetry remained independent of attention. As the most parsimonious explanation, the primary cause of the VEP asymmetry seems to be a general predominance of the RH in early perceptual processing.
本研究在双侧快速序列视觉呈现（RSVP）任务中，探究了非目标字母数字刺激所诱发的半球不对称性。我们的不对称性指标是视觉诱发电位（VEP）右半球（RH）P1和N1成分的潜伏期较短且波幅较大。这种VEP不对称性可能反映了右半球优势，可能体现在早期感知处理中，或者针对熟悉的刺激，或者用于引导注意力，又或者可能是左半球在字母处理方面专业化的一种矛盾反映。实验1表明，与熟悉的刺激（拉丁字母和阿拉伯数字）相比，对于不熟悉的刺激（藏文），VEP不对称性有所降低，不过依然存在。实验2表明，虽然向左和向右的注意力偏向会影响被关注视野对侧和同侧半球之间的关系，但VEP不对称性仍与注意力无关。作为最简洁的解释，VEP不对称性的主要原因似乎是右半球在早期感知处理中普遍占主导地位。
