完整个体和截肢者皮肤电刺激和神经内刺激脉冲频率的强度辨别力
Intensity Discriminability of Electrocutaneous and Intraneural Stimulation Pulse Frequency in Intact Individuals and Amputees
摘要：
残余神经的电刺激可用于为截肢者提供直观的感觉反馈。这种人工感觉反馈的一个重要方面是传达触觉刺激的大小的能力。使用经典的心理物理学方法，我们量化了两个完整的参与者和一个经桡动脉截肢者的皮肤电刺激脉冲频率的差异。对于经桡动脉截肢者，我们还通过长期植入的犹他州倾斜电极阵列量化了神经内微刺激脉冲频率的最小差异。我们证明，强度歧视是相似的条件：神经内微刺激的残余神经，皮肤电刺激的神经支配的残肢，和皮肤电刺激的完整的手。我们还表明，强度辨别性能是显着更好的在较低的脉冲频率比在较高的-这是独特的电皮肤和神经内刺激的发现，并表明，补充感觉线索可能存在于较低的脉冲频率。这些结果有助于指导传感器化仿生手臂的人工感觉反馈的实现。
英文摘要：
Electrical stimulation of residual nerves can be used to provide amputees with intuitive sensory feedback. An important aspect of this artificial sensory feedback is the ability to convey the magnitude of tactile stimuli. Using classical psychophysical methods, we quantified the just-noticeable differences for electrocutaneous stimulation pulse frequency in both intact participants and one transradial amputee. For the transradial amputee, we also quantified the just-noticeable difference of intraneural microstimulation pulse frequency via chronically implanted Utah Slanted Electrode Arrays. We demonstrate that intensity discrimination is similar across conditions: intraneural microstimulation of the residual nerves, electrocutaneous stimulation of the reinnervated skin on the residual limb, and electrocutaneous stimulation of intact hands. We also show that intensity discrimination performance is significantly better at lower pulse frequencies than at higher ones - a finding that's unique to electrocutaneous and intraneural stimulation and suggests that supplemental sensory cues may be present at lower pulse frequencies. These results can help guide the implementation of artificial sensory feedback for sensorized bionic arms.
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