Bonnet Clémence, Poulin-Charronnat Bénédicte, Ardonceau Vincent, Sirandré Cyril, Bard Patrick, Michel Carine
INSERM UMR 1093-CAPS, Université Bourgogne Franche-Comté, UFR des Sciences du Sport, Dijon, France.
LEAD, CNRS UMR 5022, Université Bourgogne Franche-Comté, Dijon, France.
Front Psychol. 2022 Apr 26;13:850495. doi: 10.3389/fpsyg.2022.850495. eCollection 2022.
Sensorimotor aftereffects have been widely studied after lateral prism adaptation but not after vertical prism adaptation. It is thus well-known that lateral prism adaptation produces aftereffects on visuospatial representation and, recently, on auditory perception. This study aimed to explore the sensorimotor after-effects of vertical prism adaptation as well as its aftereffects on vertical visuospatial representation (Experiment 1) and on auditory frequency representation (Experiment 2). The experimental procedure was similar in both experiments: before and after prism adaptation to an upward or a downward optical deviation, healthy young participants performed an visual open-loop pointing task and a visual (Experiment 1) or an auditory (Experiment 2) perceptual bisection task. In the visual task, the participants had to indicate if they perceived the bisection as higher or lower than the true center of a line. In the auditory task, the participants had to indicate if they perceived the target auditory frequency closer to the low or the high limit of an auditory interval. For sensorimotor aftereffects, pointing errors were computed by means of a vertical touchscreen. For the perceptual bisection task, we measured the percentage of "down" (Experiment 1) or "low" responses (Experiment 2), and we computed the visual (Experiment 1) or the auditory (Experiment 2) subjective center for each participant. Statistical analyses were carried out separately for each optical deviation in each experiment. Sensorimotor aftereffects were observed in both experiments, in the opposite direction to the optical deviation (all s < 0.01). No significant aftereffects occurred on visuospatial representation (all s > 0.5), whereas the percentage of "low" responses and the auditory subjective center significantly increased after adaptation to a downward optical deviation (all s < 0.05). Unlike lateral prism adaptation aftereffects that have been previously shown in both visuospatial horizontal representation and auditory frequency representation, aftereffects of vertical prism adaptation occurred in the auditory frequency representation but not in the vertical visuospatial representation. These results suggest that both vertical and lateral prism adaptations share a common substrate dedicated to the auditory modality (probably the temporal cortex), and that vertical adaptation does not act on the neural substrate of vertical visuospatial representation.
在横向棱镜适应后，感觉运动后效已得到广泛研究，但在垂直棱镜适应后却未被充分研究。因此，众所周知，横向棱镜适应会对视空间表征产生后效，并且最近发现对听觉感知也有影响。本研究旨在探索垂直棱镜适应的感觉运动后效及其对垂直视空间表征（实验1）和听觉频率表征（实验2）的后效。两个实验的实验程序相似：在对向上或向下的光学偏差进行棱镜适应之前和之后，健康的年轻参与者执行视觉开环指向任务以及视觉（实验1）或听觉（实验2）感知二等分任务。在视觉任务中，参与者必须指出他们感知到的二等分是高于还是低于一条线的真正中心。在听觉任务中，参与者必须指出他们感知到的目标听觉频率更接近听觉区间的下限还是上限。对于感觉运动后效，通过垂直触摸屏计算指向误差。对于感知二等分任务，我们测量了“向下”（实验1）或“低”反应（实验2）的百分比，并为每个参与者计算视觉（实验1）或听觉（实验2）主观中心。在每个实验中，针对每个光学偏差分别进行统计分析。在两个实验中均观察到感觉运动后效，其方向与光学偏差相反（所有p < 0.01）。对视空间表征未产生显著后效（所有p > 0.5），而在适应向下的光学偏差后，“低”反应的百分比和听觉主观中心显著增加（所有p < 0.05）。与先前在视空间水平表征和听觉频率表征中均已显示的横向棱镜适应后效不同，垂直棱镜适应的后效出现在听觉频率表征中，而在垂直视空间表征中未出现。这些结果表明，垂直和横向棱镜适应都共享一个专门用于听觉模态的共同基质（可能是颞叶皮质），并且垂直适应不会作用于垂直视空间表征的神经基质。
