Artificial tactile and proprioceptive feedback improves performance and confidence on object identification tasks
Artificial tactile and proprioceptive feedback improves performance and confidence on object identification tasks
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DOI：
10.1371/journal.pone.0207659
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发表时间：
2018-12-05
期刊：
影响因子：
3.7
通讯作者：
Tyler, Dustin J.
中科院分区：
文献类型：
--
作者：
Schiefer, Matthew A.;Graczyk, Emily L.;Tyler, Dustin J.
手部的体感反馈对于物体识别是必不可少的。如果没有体感反馈，个体就不能可靠地确定物体的大小或顺应性。电刺激神经可以恢复局部的触觉和本体感觉反馈，具有类似于自然感觉的强度分辨能力。我们假设，在使用假肢时，添加人工体感可以提高对象识别的准确性。为了验证这一假设，我们向两名失去上肢的受试者提供了不同形式的感觉反馈--触觉反馈、本体感觉反馈或两者兼而有之。受试者被要求在视觉和听觉失明的情况下识别放置在假手中的不同泡沫块的大小或机械顺应性。在试验期间，我们没有告知受试者他们的表现，但确实询问了他们正确识别物体的信心。最后，我们记录了物体相互作用过程中施加的压力。受试者可以自由地使用他们选择的任何策略来检查对象。无论是触觉反馈还是本体感觉反馈，物体识别都最准确。然而，每种反馈的相对重要性取决于对象的特征和任务。感觉反馈增加了受试者的信心，并与准确性直接相关。当受试者有触觉压力反馈时，他们对物体施加的压力较少。人工体感反馈改善了物体识别，触觉反馈与本体感觉反馈的相对重要性取决于测试集。我们相信，这一测试组合提供了一种有效的手段来评估感觉恢复的影响以及不同形式的反馈(触觉和动觉)在神经康复领域的相对贡献。
Somatosensory feedback of the hand is essential for object identification. Without somatosensory feedback, individuals cannot reliably determine the size or compliance of an object. Electrical nerve stimulation can restore localized tactile and proprioceptive feedback with intensity discrimination capability similar to natural sensation. We hypothesized that adding artificial somatosensation improves object recognition accuracy when using a prosthesis. To test this hypothesis, we provided different forms of sensory feedback-tactile, proprioceptive, or both-to two subjects with upper limb loss. The subjects were asked to identify the size or mechanical compliance of different foam blocks placed in the prosthetic hand while visually and audibly blinded. During trials, we did not inform the subjects of their performance, but did ask them about their confidence in correctly identifying objects. Finally, we recorded applied pressures during object interaction. Subjects were free to use any strategy they chose to examine the objects. Object identification was most accurate with both tactile and proprioceptive feedback. The relative importance of each type of feedback, however, depended on object characteristics and task. Sensory feedback increased subject confidence and was directly correlated with accuracy. Subjects applied less pressure to the objects when they had tactile pressure feedback. Artificial somatosensory feedback improves object recognition and the relative importance of tactile versus proprioceptive feedback depends on the test set. We believe this test battery provides an effective means to assess the impact of sensory restoration and the relative contribution of different forms of feedback (tactile vs. kinesthetic) within the neurorehabilitation field.