Force-Rate Cues Reduce Object Deformation Necessary to Discriminate Compliances Harder than the Skin.
Force-Rate Cues Reduce Object Deformation Necessary to Discriminate Compliances Harder than the Skin.
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DOI：
10.1109/toh.2017.2715845
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发表时间：
2018-04
影响因子：
2.9
通讯作者：
Hauser SC
中科院分区：
文献类型：
--
作者：
Hauser SC;Gerling GJ;Hauser SC;Gerling GJ;Gerling GJ;Hauser SC
抓住和操纵一个物体需要我们感知它的物质顺应性。顺应性被认为是由力、位移和指垫接触面积的关系编码的。先前的研究表明，物体必须足够变形才能变得可辨别，但时间相关线索的效用尚未得到充分探索。本研究发现，力率线索的可用性提高了顺应性判别能力，从而减少了刺激和指垫的变形。特别是，我们在被动触摸心理物理实验中测试了控制力率和位移率线索的影响。采用基于墨水的方法标记手指垫，测量每个刺激的接触面积，同时测量位移和力。顺从的范围比手指垫更硬，也更软。结果表明，当刺激控制模式为位移-速率（0.5 N）时，与力-速率（1.3 N）相比，在较低的峰值力下，柔顺性较难识别。也就是说，当位移率被控制为两种顺从之间相等时，由此产生的力率心理物理线索更容易被区分。在扩展先前的研究中，虽然某种程度的指垫变形可能足以产生可辨性，但与力有关的时间线索提供了更有效的判断。
Grasping and manipulating an object requires us to perceive its material compliance. Compliance is thought to be encoded by relationships of force, displacement and contact area at the finger pad. Prior work suggests that objects must be sufficiently deformed to become discriminable, but the utility of time-dependent cues has not been fully explored. The studies herein find that the availability of force-rate cues improve compliance discriminability so as to require less deformation of stimulus and finger pad. In particular, we tested the impact of controlling force-rate and displacement-rate cues in passive touch psychophysical experiments. An ink-based method to mark the finger pad was used to measure contact area per stimulus, simultaneously with displacement and force. Compliances spanned a range harder and softer than the finger pad. The results indicated harder compliances were discriminable at lower peak forces when the stimulus control mode was displacement-rate (0.5 N) compared to force-rate (1.3 N). That is, when displacement-rate was controlled to be equal between the two compliances, the resultant force-rate psychophysical cues could be more readily discriminated. In extending prior studies, while some magnitude of finger pad deformation may be sufficient for discriminability, temporal cues tied to force afford more efficient judgments.