期刊
JOURNAL OF NEUROPHYSIOLOGY
卷 105, 期 2, 页码 541-547出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jn.00322.2010
关键词
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资金
- European Union [IST-001917]
- Swedish Medical Research Council [08667, 20056994]
- Scuola Sant' Anna and Regione Toscana [POR-2009]
Panarese A, Edin BB. Human ability to discriminate direction of 3D force stimuli applied to the finger pad. J Neurophysiol 105: 541-547, 2011. First published November 24, 2010; doi:10.1152/jn.00322.2010. Sensory information from tactile mechanoreceptors located in the glabrous skin of the hand is crucial for skillful object exploration and manipulation. These mechanoreceptors reliably encode the direction of fingertip forces, and the brain certainly relies on this information in both sensorimotor and cognitive tasks. In this study, we examined human ability to discriminate the direction of force stimuli applied to the volar surface of the index fingertip on the basis of tactile information only. We show that humans can discriminate three-dimensional (3D) force stimuli whose directions differ by an angle as small as 7.1 degrees in the plane tangential to the skin surface. Moreover, we found that the discrimination ability was mainly affected by the time-varying phases of the stimulus, because adding a static plateau phase to the stimulus improved the discrimination threshold only to a limited extent.
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