Difference thresholds for vibration of the foot: Dependence on frequency and magnitude of vibration

Forta, Nazim Gizem; Griffin, Michael J.; Morioka, Miyuki

doi:10.1016/j.jsv.2010.08.039

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…A number of reports have investigated vibrotactile JNDs and Weber fractions on the hand, fingers and foot. These studies showed that vibrotactile Weber fractions generally range between 0.05 and 0.3 [36], [37], [38].…”

Section: Acuity and Int Esmentioning

confidence: 99%

Vibrotactile Spatial Acuity and Intensity Discrimination on the Lower Back Using Coin Motors

Stronks

Parker

Barnes

2016

IEEE Trans. Haptics

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Tactile vision substitution devices are assistive devices for the blind that redirect visual information to the skin. The amount of visual information that can be presented on a tactile display is limited mainly by the spatial resolution of the skin and the ability to distinguish between various vibration intensities. In this study, we have determined the two-point discrimination (TPD) threshold and intensity-discrimination threshold (just-noticeable difference, or JND) on the lower back using coin motors. Given the importance of stimulus timing, we have determined TPD threshold and JND at different stimulus onset asynchronies (SOAs). The JND was determined between two coin motors with a distance equal to the TPD threshold. In this way, we could establish the contrast sensitivity at the maximal theoretical resolution. TPD thresholds tended to decrease at longer SOAs, from 52 mm edge-to-edge at an SOA of 0 ms, to 28 mm at 200 ms. The JND did not depend on SOA, and the average Weber fraction was 0.14. A median of 5 JNDs was available across the available dynamic range. Together, these data provide the predicted spatial resolution and contrast resolution achievable with a back-worn tactile display based on coin motors.

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Section: Acuity and Int Esmentioning

confidence: 99%

Vibrotactile Spatial Acuity and Intensity Discrimination on the Lower Back Using Coin Motors

Stronks

Parker

Barnes

2016

IEEE Trans. Haptics

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“…The frequency at which the hand-arm system is believed to be at greatest risk of injury is in the 20-40 Hz range, while the fingers are at greater risk above 100 Hz [14,19], because exposure at these frequencies leads to vibration amplification. In a study examining the absolute threshold of the feet, for a seated person exposed to FTV, Forta et al [23] found the absolute threshold to occur between 8-25 Hz and all participants indicated they felt vibration most at the sole of the feet when exposed to FTV at 125 Hz. Although this study offered some evidence of the biodynamic response, of the foot to FTV, it did not evaluate absolute threshold when a person was standing nor did it measure transmissibility or report resonance values for the feet.…”

Section: Introductionmentioning

confidence: 99%

Study of the biodynamic response of the foot to vibration exposure

Goggins

Godwin

Larivière

et al. 2016

OER

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Abstract.BACKGROUND: Exposure to foot-transmitted vibration (FTV) has been linked to injury; however, the biodynamic response of the foot to FTV has not been quantified. OBJECTIVE: The objective was to measure vibration transmissibility from the floor-to-ankle, and the floor-to-metatarsal, during exposure to FTV while standing, and to determine if FTV exposure frequency, or participant mass or arch index (AI) influence the transmission of FTV through the foot. METHODS: Participants' AI was measured. Four ADXL326, tri-axial accelerometers were utilized to measure vibration on the platform medial to distal head of first metatarsal, on the distal head of first metatarsal, on the platform paralleling the medial malleolus, and on the lateral malleolus. Participants were randomly exposed to FTV at 25 Hz, 30 Hz, 35 Hz, 40 Hz, 45 Hz, and 50 Hz for 45 seconds. CONCLUSIONS:The greatest transmissibility magnitude measured at the metatarsal and ankle occurred at 50 Hz and 25-30 Hz respectively, suggesting the formation of a local resonance at each location.

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“…The measurements suggest that differences between positions and the influence of local resonances should be clearly perceivable because they are considerably larger than the perceivable difference in the acceleration level, which is approximately 1.5 dB (Forta, 2009). In addition, the dynamic range for vibration perception is quite small, which results in strongly perceived vibration intensity differences even for small changes in acceleration level.…”

Section: Discussionmentioning

confidence: 82%

Research Papers: Music-Induced Vibrations in a Concert Hall and a Church

Merchel¹,

Altınsoy²

2013

Archives of Acoustics

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Sound and vibrations are often perceived via the auditory and tactile senses simultaneously, e.g., in a car or train. During a rock concert, the body vibrates with the rhythm of the music. Even in a concert hall or a church, sound can excite vibrations in the ground or seats. These vibrations might not be perceived separately because they integrate with the other sensory modalities into one multi-modal perception.This paper discusses the relation between sound and vibration for frequencies up to 1 kHz in an opera house and a church. Therefore, the transfer function between sound pressure and acceleration was measured at different exemplary listening positions. A dodecahedron loudspeaker on the stage was used as a sound source. Accelerometers on the ground, seat and arm rest measured the resulting vibrations. It was found that vibrations were excited over a broad frequency range via airborne sound. The transfer function was measured using various sound pressure levels. Thereby, no dependence on level was found. The acceleration level at the seat corresponds approximately to the sound pressure level and is independent of the receiver position. Stronger differences were measured for vibrations on the ground.

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Difference thresholds for vibration of the foot: Dependence on frequency and magnitude of vibration

Cited by 3 publications

References 19 publications

Vibrotactile Spatial Acuity and Intensity Discrimination on the Lower Back Using Coin Motors

Vibrotactile Spatial Acuity and Intensity Discrimination on the Lower Back Using Coin Motors

Study of the biodynamic response of the foot to vibration exposure

Research Papers: Music-Induced Vibrations in a Concert Hall and a Church

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