视觉替代应用中舌电触觉刺激的扫视效应
Effect of saccades in tongue electrotactile stimulation for vision substitution applications
摘要：
视觉替代范式旨在方便盲人的生活。通常使用电刺激装置，其中电极被布置成阵列以刺激皮肤或舌粘膜，从而向受试者发送视觉类型的信号。当连续施加电刺激信号时（例如，当长时间显示静态视觉场景时），受影响区域的受体可能饱和，患者可能丢失显示的信息。我们在这里提出了一些改善电刺激信息感知质量的机制。电信号被编码为通过舌头显示单元投射到舌头上的2D场景，舌头显示单元即由12x12电极矩阵形成的电触觉刺激器。我们建议在这个信号上应用随机扫视。我们的假设是，由于触觉感受器饱和度的降低，这种眼睛启发的机制应该使视觉替代更有效（通过改善感知）。通过一系列实验评估了扫视的影响。结果显示，由于扫视的感知持久性的好处。这项工作有助于防止舌头上的受体饱和。因此，通过电刺激的方式来提高视觉质量。它允许对遭受相同现象的视网膜假体装置的新的增强特征。
英文摘要：
The visual substitution paradigm aims to facilitate the life of blind people. Generally one uses electro-stimulating devices where electrodes are arranged into arrays to stimulate the skin or the tongue mucosa to send signals of visual type to the subjects. When an electro-stimulation signal is applied continuously (e.g. when static visual scenes are displayed for a long period of time), the receptors of the affected region can get saturated and the patient may lose the displayed information. We propose here some mechanisms that ameliorate the quality of perception of the electro-stimulation information. The electrical signal is encoded as 2D scenes projected onto the tongue via a Tongue Display Unit, i.e. an electro-tactile stimulator formed by a 12x12 matrix of electrodes. We propose to apply stochastic saccades on this signal. Our assumption is that this eye-inspired mechanism should make the visual substitution more efficient (by improving the perception) because of the reduction of the tactile receptors saturation. The influence of saccades was evaluated by a series of experiments. Results revealed a benefit on the persistence of perception due to saccades. This work helps to prevent the saturation of receptors on the tongue. Therefore increasing the quality of vision by the way of the electro-stimulation. It allows new enhancement features to retinal prosthesis devices which suffer from the same phenomenon.
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