Schmitz Gerd, Bock Otmar
Institute of Physiology and Anatomy, German Sport University, Köln, Germany; Institute of Sports Science, Leibniz University Hannover, Hannover, Germany.
Institute of Physiology and Anatomy, German Sport University, Köln, Germany.
PLoS One. 2014 Sep 25;9(9):e107834. doi: 10.1371/journal.pone.0107834. eCollection 2014.
We compared sensorimotor adaptation in the visual and the auditory modality. Subjects pointed to visual targets while receiving direct spatial information about fingertip position in the visual modality, or they pointed to visual targets while receiving indirect information about fingertip position in the visual modality, or they pointed to auditory targets while receiving indirect information about fingertip position in the auditory modality. Feedback was laterally shifted to induce adaptation, and aftereffects were tested with both target modalities and both hands. We found that aftereffects of adaptation were smaller when tested with the non-adapted hand, i.e., intermanual transfer was incomplete. Furthermore, aftereffects were smaller when tested in the non-adapted target modality, i.e., intermodal transfer was incomplete. Aftereffects were smaller following adaptation with indirect rather than direct feedback, but they were not smaller following adaptation with auditory rather than visual targets. From this we conclude that the magnitude of adaptive recalibration rather depends on the method of feedback delivery (indirect versus direct) than on the modality of feedback (visual versus auditory).
我们比较了视觉和听觉模态下的感觉运动适应情况。受试者在视觉模态下接收有关指尖位置的直接空间信息时指向视觉目标，或者在视觉模态下接收有关指尖位置的间接信息时指向视觉目标，又或者在听觉模态下接收有关指尖位置的间接信息时指向听觉目标。反馈进行横向偏移以诱导适应，并且用两种目标模态和双手测试后效。我们发现，用未适应的手进行测试时，适应的后效较小，即双侧间的转移是不完全的。此外，在未适应的目标模态下进行测试时，后效较小，即跨模态转移是不完全的。间接反馈而非直接反馈适应后的后效较小，但听觉目标而非视觉目标适应后的后效并非较小。由此我们得出结论，适应性重新校准的幅度更多地取决于反馈传递的方式（间接与直接），而非反馈的模态（视觉与听觉）。
