Exploratory Strategies in Haptic Softness Discrimination Are Tuned to Achieve High Levels of Task Performance
Exploratory Strategies in Haptic Softness Discrimination Are Tuned to Achieve High Levels of Task Performance
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DOI：
10.1109/toh.2011.19
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发表时间：
2011-10-01
影响因子：
2.9
通讯作者：
Drewing, Knut
中科院分区：
文献类型：
--
作者：
Kaim, Lukas;Drewing, Knut
触觉本质上依赖于所执行的探索性动作。据推测，自发执行的动作对于相关触觉属性的计算是优化的。我们调查了人们在多大程度上策略性地执行针对具有可变形表面的物体的柔软度辨别而调整的动作。在实验1中，我们研究了运动参数如何依赖于预期的刺激顺应性。在辨别任务中，我们测量了较不顺从(硬)刺激和较顺从(软)刺激的探索力。在实验2中，我们考察了探索力是否也取决于两种刺激之间的预期顺应性差异。结果表明，与较软的物体相比，参与者在期望较硬的物体时施加更大的力，并且他们对较小的顺应性差异施加的力比对较大的物体施加的力更大。实验3考察了外力如何影响通过仅显著差异(JND)来评估的对柔软性的差异敏感性。对于软刺激，JND不依赖于力。对于硬刺激，如果参与者使用的力量比自然使用的少，JND就会变得“更糟糕”(更高)。我们的结论是，施加高压是获得高差异敏感度的一种强有力的策略，如果成功的辨别绩效需要，参与者会使用这种策略。
Haptic perception essentially depends on the executed exploratory movements. It has been speculated that spontaneously executed movements are optimized for the computation of associated haptic properties. We investigated to what extent people strategically execute movements that are tuned for softness discrimination of objects with deformable surfaces. In Experiment 1, we investigated how movement parameters depend on expected stimulus compliance. In a discrimination task, we measured exploratory forces for less compliant (hard) stimuli and for more compliant (soft) stimuli. In Experiment 2, we investigated whether exploratory force also depends on the expected compliance difference between the two stimuli. The results indicate that participants apply higher forces when expecting harder objects as compared to softer objects, and they apply higher forces for smaller compliance differences than for larger ones. Experiment 3 examined how applied force influences differential sensitivity for softness as assessed by just noticeable differences (JNDs). For soft stimuli, JNDs did not depend on force. For hard stimuli, JNDs were "worse" (higher) if participants applied less force than they use naturally. We conclude that applying high force is a robust strategy to obtain high differential sensitivity, and that participants used this strategy if it was required for successful discrimination performance.