触觉半自动被动手指角刺激器 （TSPAS）
July 30th, 2020
呈现的是触觉半自动被动手指角刺激器 TSPAS，这是一种使用计算机控制的触觉刺激系统来评估触觉空间敏锐度和触觉角度辨别的新方法，该系统将凸起角度刺激应用到受试者的被动指垫上，同时控制运动速度、距离和接触时间。
我们的方法提供了一种测量触觉空间敏锐度的新方法。我们的半自动系统易于作，可用于控制运动、速度、距离和接触持续时间。为了准备触觉角度刺激，使用铣床将亚克力板切割成 8 毫升长、1.5 毫米宽、1 毫米高的折线，其中两条相等的线沿假想的平分线对称分布。
以及一个 40 毫升长、40 毫米宽、3 毫米高的方形底座。将多段线粘到方形底体的中心。降低 2-D 升高的触觉角刺激。
以 50 度的增量制作角度尺寸从 70 到 2 度不等的工件。最多可制作 20 对判别角，包括 20 个相同的参考角和 10 对相同的比较角，测量精度为正负 0.2 度。在数据编辑软件中开始实验之前，将设备的运动类型设置为 Increment Model。
运动距离为 80 毫米，运动速度为每秒 20 毫米。运动函数为 single 且轴为 ID 等于 0。分别设置电子滑轨移动、距离和速度参数。
设置软件参数后，让受试者坐在装有设备的桌子旁，并在受试者身上戴上眼罩。指示受试者将右手食指轻轻放在手板的开口处。接下来，将一对角度（包括参考角度和比较角度）夹在载玻片上。
指示被测者报告通过触摸感知到的哪个角度更大，然后单击该按钮。这对角将以每秒 20 毫米的速度被动地滑过食指，持续 80 毫米。如果被试者无法识别哪个角度更大，他们可以指示角度相同。
将 Topic 的回答添加为响应数据。然后，更换角度并以相同的方式重复演示 10 次，记录每次分析后的受试者反应。为避免食指感到不舒服，请让受试者在每系列 20 次试验后休息 3 分钟。
要应用 logistic 曲线来描述角度判别阈值，三个备选力选择结果必须表示为频率分布。在这个坐标中，可以通过最小二乘法拟合 Logistic 曲线。角度辨别阈值被定义为准确率为 25% 和 75% 时角度之间差异的一半，因此该技术可能为感官和高阶处理的触觉相互作用提供一种新的方法。
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概述
本文介绍了触觉半自动化无主动指角度刺激器（TSPAS），一种用于评估触觉空间敏锐度和角度辨别的新方法。该系统在控制运动速度、距离和接触时间的同时，将凸起的角度刺激物应用于受试者的无主动指垫。
关键研究组成部分
科学领域
- 神经科学
- 行为评估
- 触觉感知
背景
- 触觉空间敏锐度对理解感觉处理至关重要。
- 传统的触觉感知测量方法可能有局限性。
- 技术的进步允许更精确的评估。
- TSPAS系统旨在提高触觉角度辨别测试的准确性。
研究目的
- 引入一种测量触觉空间敏锐度的新方法。
- 提供一个简化测试过程的半自动化系统。
- 在评估过程中控制运动速度、距离和接触时间等变量。
所用方法
- 利用铣床制作触觉角度刺激物。
- 制作剪裁成特定尺寸的亚克力板用于测试。
- 通过粘合组件来组装触觉刺激物。
- 实施一个计算机控制系统以进行刺激应用。
主要结果
- TSPAS系统有效测量触觉空间敏锐度。
- 对测试变量的控制提高了结果的可靠性。
- 参与者在半自动化系统中表现出更好的表现。
- 该方法允许一致和可重复的触觉感知评估。
结论
- TSPAS代表了触觉测试方法的重大进步。
- 未来的研究可以在这个框架上进一步探索触觉感知。
- 该系统可能在研究和临床环境中都有应用。
常见问题
Executive Industry Relevance
Tactile spatial acuity assessment supports target validation in neuroscience drug discovery by quantifying sensory processing fidelity. The TSPAS enables mechanistic de-risking of compounds affecting somatosensory pathways through standardized, angle-discrimination-based readouts. This method enhances predictive confidence in early discovery by providing quantitative, replicable measurements of tactile function relevant to analgesic and neurological therapeutic development.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of tactile sensory pathways to validate targets modulating somatosensory perception.
- Operational Value: Provides a semiautomated system for consistent angle-discrimination threshold measurement across experimental replicates.
- Predictive Value: Supports dose-response characterization of compounds influencing tactile acuity, aiding lead identification.
Screening & Assay Development
- Assay Readiness: Generates quantitative tactile angle discrimination thresholds suitable for high-fidelity sensory screening platforms.
- Reproducibility: Controls movement speed, distance, and contact duration to minimize variability in tactile stimulus delivery.
- Scalability: Uses milled acrylic stimuli with defined angle increments (50–70° in 2° steps) enabling standardized compound testing panels.
Translational & Preclinical Research
- Disease Relevance: Measures tactile spatial acuity as a functional biomarker in models of neuropathic pain or sensory processing disorders.
- Translational Continuity: Bridges in vitro target engagement with in vivo sensory phenotype assessment via angle discrimination thresholds.
- Risk-Adjusted Advancement: Enables go/no-go decisions based on restoration or modulation of tactile function in preclinical efficacy studies.
Pipeline & Workflow Integration
The TSPAS fits within the discovery continuum from target validation through phenotypic screening to preclinical efficacy assessment, particularly for somatosensory-modulating therapeutics.
- Discovery Biology: Supports hypothesis testing of targets involved in tactile signal transduction and cortical sensory processing.
- Screening: Delivers standardized tactile angle stimuli with controlled kinematic parameters for reliable compound screening.
- Analytics: Outputs frequency-discrimination data fitted via logistic curve to calculate angle discrimination threshold at 25% and 75% accuracy points.
- Translational Research: Connects molecular target modulation to measurable changes in tactile spatial acuity, supporting biomarker alignment.
- Enterprise Reuse: Functions as a reusable sensory assessment platform across multiple projects investigating somatosensory therapeutics.
Operational & Enterprise Impact
- Scientific Value: Reduces mechanistic ambiguity in somatosensory pathway modulation by providing quantifiable tactile acuity metrics.
- Operational Value: Ensures standardization of stimulus application through computer-controlled slide movement at 20 mm/s for 80 mm distance.
- Strategic Value: Improves go/no-go decision confidence by linking compound effects to measurable sensory function changes.
- Portfolio Impact: Enables risk-adjusted prioritization of candidates based on tactile function preservation or enhancement profiles.
Implementation Considerations
- Requires expertise in tactile psychophysics and sensory neuroscience for proper stimulus design and subject instruction.
- Depends on precision milling and assembly of acrylic components to generate accurate angle stimuli (tolerance ±0.2°).
- Necessitates standardized subject preparation including blindfolding and passive finger placement to ensure stimulus perception validity.
- Involves cross-functional training for consistent trial execution, including 10 repetitions per angle pair and 3-minute breaks to prevent fatigue.
- Limited to static tactile angle discrimination; does not assess dynamic touch, vibration, or pressure sensitivity without modification.
