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Tactile spatial discrimination on the torso using vibrotactile and force stimulation
Experimental Brain Research ( IF 2 ) Pub Date : 2021-08-23 , DOI: 10.1007/s00221-021-06181-x
Atena Fadaei Jouybari 1, 2 , Matteo Franza 1, 2 , Oliver Alan Kannape 1, 2 , Masayuki Hara 3 , Olaf Blanke 1, 2, 4
Affiliation  

There is a steadily growing number of mobile communication systems that provide spatially encoded tactile information to the humans’ torso. However, the increased use of such hands-off displays is currently not matched with or supported by systematic perceptual characterization of tactile spatial discrimination on the torso. Furthermore, there are currently no data testing spatial discrimination for dynamic force stimuli applied to the torso. In the present study, we measured tactile point localization (LOC) and tactile direction discrimination (DIR) on the thoracic spine using two unisex torso-worn tactile vests realized with arrays of 3 × 3 vibrotactile or force feedback actuators. We aimed to, first, evaluate and compare the spatial discrimination of vibrotactile and force stimulations on the thoracic spine and, second, to investigate the relationship between the LOC and DIR results across stimulations. Thirty-four healthy participants performed both tasks with both vests. Tactile accuracies for vibrotactile and force stimulations were 60.7% and 54.6% for the LOC task; 71.0% and 67.7% for the DIR task, respectively. Performance correlated positively with both stimulations, although accuracies were higher for the vibrotactile than for the force stimulation across tasks, arguably due to specific properties of vibrotactile stimulations. We observed comparable directional anisotropies in the LOC results for both stimulations; however, anisotropies in the DIR task were only observed with vibrotactile stimulations. We discuss our findings with respect to tactile perception research as well as their implications for the design of high-resolution torso-mounted tactile displays for spatial cueing.



中文翻译:

使用振动触觉和力刺激对躯干的触觉空间辨别

越来越多的移动通信系统向人类躯干提供空间编码的触觉信息。然而,这种免提显示器的使用增加目前与躯干上触觉空间辨别的系统感知表征不匹配或不支持。此外,目前没有数据测试施加到躯干的动态力刺激的空间辨别力。在本研究中,我们使用由 3 × 3 振动触觉或力反馈执行器阵列实现的两件男女通用的躯干穿戴式触觉背心测量了胸椎上的触觉点定位 (LOC) 和触觉方向辨别 (DIR)。我们的目标是,首先,评估和比较振动触觉和力刺激对胸椎的空间辨别力,其次,研究 LOC 和 DIR 跨刺激结果之间的关系。34 名健康参与者穿着两件背心完成了这两项任务。对于 LOC 任务,振动触觉和力刺激的触觉准确度分别为 60.7% 和 54.6%;DIR 任务分别为 71.0% 和 67.7%。性能与这两种刺激呈正相关,尽管振动触觉的准确性高于跨任务的力刺激,这可能是由于振动触觉刺激的特定特性所致。我们在两种刺激的 LOC 结果中观察到相当的方向各向异性。然而,仅在振动触觉刺激下观察到 DIR 任务中的各向异性。

更新日期:2021-08-24
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