Roughness encoding in human and biomimetic artificial touch: spatiotemporal frequency modulation and structural anisotropy of fingerprints

The influence of fingerprints and their curvature in tactile sensing performance is investigated by comparative analysis of different design parameters in a biomimetic artificial fingertip, having straight or curved fingerprints. The strength in the encoding of the principal spatial period of ridged...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2011-06, Vol.11 (6), p.5596-5615
Main Authors: Oddo, Calogero Maria, Beccai, Lucia, Wessberg, Johan, Wasling, Helena Backlund, Mattioli, Fabio, Carrozza, Maria Chiara
Format: Article
Language:English
Subjects:
Algorithms
Anisotropy
artificial touch
biomimetic fingertip
Biomimetics
biorobotics
Biosensing Techniques - methods
Comparative analysis
Control Engineering
Dermatoglyphics
Electronic mail systems
fingerprints
Fingers - physiology
Fourier Analysis
Fysiologi och anatomi
Human subjects
human touch
Humans
mechanoreceptors
Mechanoreceptors - physiology
MEMS tactile sensor array
Microelectromechanical systems
microneurography
Models, Statistical
Physiology and Anatomy
Pressure
Reglerteknik
Reproducibility of Results
Robotics
roughness encoding
Sensors
Skin Physiological Phenomena
Surface Properties
Time Factors
Touch
Touch Perception
User-Computer Interface
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Summary:The influence of fingerprints and their curvature in tactile sensing performance is investigated by comparative analysis of different design parameters in a biomimetic artificial fingertip, having straight or curved fingerprints. The strength in the encoding of the principal spatial period of ridged tactile stimuli (gratings) is evaluated by indenting and sliding the surfaces at controlled normal contact force and tangential sliding velocity, as a function of fingertip rotation along the indentation axis. Curved fingerprints guaranteed higher directional isotropy than straight fingerprints in the encoding of the principal frequency resulting from the ratio between the sliding velocity and the spatial periodicity of the grating. In parallel, human microneurography experiments were performed and a selection of results is included in this work in order to support the significance of the biorobotic study with the artificial tactile system.
ISSN:1424-8220
1424-8220
DOI:10.3390/s110605596