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Passive and active discrimination of natural frequency of virtual dynamic systems

Israr, Ali and Li, Yanfang and Patoğlu, Volkan and O'Malley, Marcia K. (2009) Passive and active discrimination of natural frequency of virtual dynamic systems. IEEE Transactions on Haptics, 2 (1). pp. 40-51. ISSN 1939-1412

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Official URL: http://doi.ieeecomputersociety.org/10.1109/TOH.2008.21

Abstract

It has been shown that humans use combined feedforward and feedback control strategies when manipulating external dynamic systems, and when exciting virtual dynamic systems at resonance, they can tune their control parameters in response to changing natural frequencies. We present a study to determine the discrimination thresholds for the natural frequency of such resonant dynamic systems. Weber fractions (WFs in %) are reported for the discrimination of 1, 2, 4, and 8 Hz natural frequencies. Participants were instructed either to passively perceive or actively excite the virtual system via a one degree-of-freedom haptic interface with visual and/or haptic feedback. The average WF for natural frequency ranged from 4% to 8.5% for 1, 2, and 4 Hz reference natural frequencies, while the WF was approximately 20% for systems with a reference natural frequency of 8 Hz. Results indicate that sensory feedback modality has a significant effect on WF in passive perception, but no significant effect in the active perception case. The data also suggest that discrimination sensitivity is not significantly affected by excitation mode. Finally, results for systems with equivalent natural frequencies but different spring stiffness indicate that participants do not discriminate natural frequency based on the maximum force magnitude perceived.

Item Type:Article
Uncontrolled Keywords:Perception and psychophysics, Touch-based properties and capabilities of the human user, Human Haptics, Active and passive touch, natural frequency discrimination, Weber fractions, virtual resonance task, rhythmic movements, Touch-based properties and capabilities of the human user
Subjects:UNSPECIFIED
ID Code:13032
Deposited By:Volkan Patoğlu
Deposited On:02 Dec 2009 12:20
Last Modified:07 Dec 2009 01:33

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