Grzeschik Ramona, Lewald Jörg, Verhey Jesko L, Hoffmann Michael B, Getzmann Stephan
Department of Experimental Audiology, Otto-von-Guericke-University Magdeburg, Leipziger Straße 44, Magdeburg, D-39120, Germany.
Department of Cognitive Psychology, Auditory Cognitive Neuroscience Laboratory, Ruhr University Bochum, Bochum, Germany.
Eur J Neurosci. 2016 Jan;43(1):66-77. doi: 10.1111/ejn.13102. Epub 2015 Nov 22.
Adaptation to visual or auditory motion affects within-modality motion processing as reflected by visual or auditory free-field motion-onset evoked potentials (VEPs, AEPs). Here, a visual-auditory motion adaptation paradigm was used to investigate the effect of visual motion adaptation on VEPs and AEPs to leftward motion-onset test stimuli. Effects of visual adaptation to (i) scattered light flashes, and motion in the (ii) same or in the (iii) opposite direction of the test stimulus were compared. For the motion-onset VEPs, i.e. the intra-modal adaptation conditions, direction-specific adaptation was observed--the change-N2 (cN2) and change-P2 (cP2) amplitudes were significantly smaller after motion adaptation in the same than in the opposite direction. For the motion-onset AEPs, i.e. the cross-modal adaptation condition, there was an effect of motion history only in the change-P1 (cP1), and this effect was not direction-specific--cP1 was smaller after scatter than after motion adaptation to either direction. No effects were found for later components of motion-onset AEPs. While the VEP results provided clear evidence for the existence of a direction-specific effect of motion adaptation within the visual modality, the AEP findings suggested merely a motion-related, but not a direction-specific effect. In conclusion, the adaptation of veridical auditory motion detectors by visual motion is not reflected by the AEPs of the present study.
对视觉或听觉运动的适应会影响同模态内的运动处理，这可通过视觉或听觉自由场运动起始诱发电位（VEP，AEP）反映出来。在此，采用视觉 - 听觉运动适应范式来研究视觉运动适应对VEP和AEP的影响，这些电位是针对向左运动起始测试刺激产生的。比较了视觉适应（i）散射光闪烁以及（ii）与测试刺激相同或（iii）相反方向运动的效果。对于运动起始VEP，即同模态适应条件，观察到了方向特异性适应——在相同方向而非相反方向进行运动适应后，变化 - N2（cN2）和变化 - P2（cP2）的幅度显著更小。对于运动起始AEP，即跨模态适应条件，仅在变化 - P1（cP1）中存在运动历史的影响，且这种影响并非方向特异性的——在散射后cP1比在向任一方向进行运动适应后更小。未发现运动起始AEP后期成分有影响。虽然VEP结果为视觉模态内存在运动适应的方向特异性效应提供了明确证据，但AEP结果仅表明存在与运动相关而非方向特异性的效应。总之，本研究的AEP未反映出视觉运动对真实听觉运动探测器的适应情况。
