Detection of vibration transmitted through an object grasped in the hand
Detection of vibration transmitted through an object grasped in the hand
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DOI：
10.1152/jn.1999.81.4.1548
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发表时间：
1999-04-01
影响因子：
2.5
通讯作者：
Johnson, KO
中科院分区：
文献类型：
--
作者：
Brisben, AJ;Hsiao, SS;Johnson, KO
工具或探头通常起到手的延伸的作用，将振动传递到手以产生物体接触工具或探头的感觉。本文报道了心理物理和神经生理学相结合的THR研究的心理物理结果：通过手中握住的圆柱体传递的振动感知。在心理物理研究的第一部分，19名受试者握着一个直径32毫米的圆柱体。内嵌电机可引起与气缸轴线平行的振动。阈值与频率之间呈传统的U型函数关系，最小值在150~200hn之间。除了贝克西的一项研究中，受试者抓住一根平行于皮肤表面振动的杆子，20赫兹以上的阈值比之前报道的任何一次都要低，斜率也更陡，阈值是20赫兹是基于太平洋神经传入的活动。与以往报道相比，极高的灵敏度可能是由于接触面积、振动方向、接触力和刺激探头形状的不同造成的。对每个变量的影响进行了研究。在40和300赫兹(接近帕西尼范围下端和上端的频率)下，受试者握住圆柱体时的阈值分别比I-mm-diam探头垂直于皮肤振动时低9.8和18.5分贝(68和88%)。这些差异如下：i)用大圆柱体表面获得的单个指垫上的阈值比用点状探头获得的阈值分别平均低20%和60%；2)手掌上的阈值比指垫上的分别平均低15%和40%；3)受试者握住圆柱体时获得的阈值分别平均低40%和20%。而当圆柱体只接触手掌时：4)圆柱体接触两个手指的阈值分别为10%和30%。圆柱体与3根手指接触时的阈值：与皮肤表面平行振动的阈值平均分别比垂直皮肤振动阈值低10%和30%。接触力在0.05~1.0N范围内变化不大。
A tool or probe often function as an extension of the hand, transmitting vibrations to the hand to produce a percept of the object contacting the tool or probe. This paper reports the psychophysical results of a combined psychophysical and neurophysiological study of thr: perception of vibration transmitted through a cylinder grasped in the hand. In the first part of the psychophysical study, 19 subjects grasped a cylinder, 32 mm diam. with an embedded motor that caused vibration parallel to the axis of the cylinder. The relationship between threshold and frequency was the traditional U-shaped function with a minimum between 150 and 200 Hn. Except a study by Bekesy in which subjects grasped a rod that vibrated parallel to the skin surface, thresholds above 20 Hz were lower and the slopes were steeper than any reported previously, Thresholds were 20 Hz was based on activity in Pacinian afferents. The extreme sensitivity compared with previous reports may have resulted from differences in contact area, direction of vibration, contact force, and the shape of the stimulus probe. The effects of each of these variables were studied. At 40 and 300 Hz (frequencies near the lower and upper end of the Pacinian range) thresholds were 9.8 and 18.5 dB (68 and 88%) lower, respectively, when subjects grasped the cylinder than when a I-mm-diam probe vibrated perpendicular to the skin. These differences were accounted far as follows: I) thresholds at a single fingerpad obtained with the large cylindrical surface were, on average, 20 and 60% lower, respectively, than thresholds with the punctate probe: 2) thresholds at the palm were, an average, 15 and 40% lower, respectively, than at the fingerpads;: 3) thresholds obtained when the subjects grasped the cylinder averaged 40 and 20% less, respectively. than when the cylinder contacted only the palm: 4) thresholds with the cylinder contacting two fingers were 10 and 30% lox er. respectively, than thresholds with the cylinder contacting 3 single finger: and 5) thresholds with vibration parallel to the skin surface were on average, 10 and 30% lower, respectively, than thresholds xith vibration perpendicular to the skin. Contact force, which was varied from 0.05 to 1.0 N, had no effect.