Stronks H Christiaan, Parker Daniel J, Stacey Ashley, Barnes Nick
Department of Computer Vision, Data61 CSIRO, Canberra, Australia.
Department of Otorhinolaryngology, Leiden University Medical Center, Leiden, The Netherlands.
Artif Organs. 2018 Dec;42(12):1224-1233. doi: 10.1111/aor.13134. Epub 2018 May 15.
Tactile vision substitution devices present visual images as tactile representations on the skin. In this study we have tested the performance of a prototype 96-tactor vibrotactile using a subset of 64 tactors. We have determined the tactile spatial acuity and intensity discrimination in 14 naïve subjects. Spatial acuity was determined using a grating acuity task. Subjects could successfully identify the orientation of horizontal and vertical gratings with an average psychophysical threshold of 120 mm. When diagonal gratings were included in the analysis, the median performance dropped below psychophysical threshold, but was still significantly above chance at gratings of 142 mm wide. Intensity discrimination yielded an average Weber fraction of 0.44, corresponding to 13 discernable "gray levels" in the available dynamic range. Interleaved stimulation of the motors did not significantly affect spatial acuity or intensity discrimination.
触觉视觉替代设备将视觉图像呈现为皮肤上的触觉表征。在本研究中，我们使用64个触觉器的子集测试了一个96触觉器振动触觉原型的性能。我们测定了14名未接触过该设备的受试者的触觉空间敏锐度和强度辨别能力。使用光栅敏锐度任务测定空间敏锐度。受试者能够成功识别水平和垂直光栅的方向，平均心理物理学阈值为120毫米。当分析中纳入对角光栅时，中位数表现降至心理物理学阈值以下，但在宽度为142毫米的光栅上仍显著高于随机水平。强度辨别产生的平均韦伯分数为0.44，对应于可用动态范围内13个可辨别的“灰度级”。电机的交错刺激对空间敏锐度或强度辨别没有显著影响。
