Two point vibrotactile spatial resolution as a function of pulse frequency and pulse width

Perez, Claudio A.; Holzmann, Carsten; Sandoval, Ernesto

doi:10.1109/iembs.1998.744968

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…As ST = 20PRP, it was necessary to determine whether the dependence of the two-point discrimination was due to PRP or ST. As ST was variable in cases 1 and 2, case 3 was included to compare results for fixed ST. A group of eight subjects were tested for case 3. In previous work on tangential stimulation of the index finger, it was found that the discrimination distance had the same dependence as a function of PRP for fixed or variable ST (PEREZ et al, 1998).…”

Section: Methodsmentioning

confidence: 78%

“…The stimulus amplitude was maintained around 20 dB above the absolute sensation threshold to ensure that both contact points elicited tactile sensation at all PRP. The frequency response had been measured previously on a different population with the same set of vibrators (PEREZ et al, 1998). The amplitudes were preprogrammed on a system based on a microcontroller, and therefore the time involved in changing from one type of stimulus to another was not significant.…”

Section: Methodsmentioning

confidence: 99%

“…The spatiotemporal stimuli involved only sinusoids, with the objective of performing linear analysis (VANDOREN et al, 1987). In PEREZ et al (1998), results were presented on the two-point spatial discrimination distance as a function of PRP and PW using tangential stimulation to the skin. Results showed that the twopoint discrimination distance was better for longer than for shorter PRPs.…”

Section: Spatial Discriminationmentioning

confidence: 99%

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Two-point vibrotactile discrimination related to parameters of pulse burst stimulus

Perez

Holzmann

Jaeschke

2000

Med. Biol. Eng. Comput.

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Tactile spatial resolution is an important factor in the design of vibrotactile arrays. The two-point discrimination distance is used as a measure of tactile spatial resolution. An experimental study is presented showing the effect of pulse burst stimulus parameters, pulse repetition period and duty cycle on two-point vibrotactile spatial discrimination. An array of piezoceramic vibrators is used to measure two-point spatial discrimination on the index finger. In a group of 14 subjects, the average two-point discrimination distance for a pulse repetition period of 1/25s is 2.1 mm (SD = 1.0), whereas for 1/500 s it is 5.1 mm (SD = 0.9). Differences in discrimination distances are statistically significant according to the ANOVA analysis (p < 0.001). Results show that the two-point discrimination distance is better for longer pulse repetition periods. Therefore the pulse repetition period in an excitatory waveform composed of bursts of pulses is important for tactile resolution. No statistically significant differences in discrimination distances are found between bursts of pulses of 50% duty cycle and those of lower duty cycle. The latter result indicates that, by choosing low-duty cycle waveforms for vibrotactile stimulation, the power can be reduced with no loss in two-point discrimination capacity.

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Section: Methodsmentioning

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Section: Spatial Discriminationmentioning

confidence: 99%

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Two-point vibrotactile discrimination related to parameters of pulse burst stimulus

Perez

Holzmann

Jaeschke

2000

Med. Biol. Eng. Comput.

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“…Tactile sensitivity varies across the hand. For example, the best vibrotactile acuity (in the millimeter range) is observed on the volar face of the fingers [60], [61], against ranges going up to a few centimeters on the palm [62]. Thus, it seems reasonable to assume that actuator location with respect to the hand may affect location discrimination, leading us to hypothesize (H7): Stimulus locations relative to the hand will affect location discrimination accuracy.…”

Section: Research Question and Hypothesesmentioning

confidence: 98%

Does Multi-Actuator Vibrotactile Feedback Within Tangible Objects Enrich VR Manipulation?

Cabaret

Howard

Gicquel

et al. 2024

IEEE Trans. Visual. Comput. Graphics

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Rich, informative and realistic haptic feedback is key to enhancing Virtual Reality (VR) manipulation. Tangible objects provide convincing grasping and manipulation interactions with haptic feedback of e.g., shape, mass and texture properties. But these properties are static, and cannot respond to interactions in the virtual environment. On the other hand, vibrotactile feedback provides the opportunity for delivering dynamic cues rendering many different contact properties, such as impacts, object vibrations or textures. Handheld objects or controllers in VR are usually restricted to vibrating in a monolithic fashion. In this paper, we investigate how spatialiazing vibrotactile cues within handheld tangibles could enable a wider range of sensations and interactions. We conduct a set of perception studies, investigating the extent to which spatialization of vibrotactile feedback within tangible objects is possible as well as the benefits of proposed rendering schemes leveraging multiple actuators in VR. Results show that vibrotactile cues from localized actuators can be discriminated and are beneficial for certain rendering schemes.

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“…Second, and more importantly, our study does not aim to provide any threshold measures relating to human physiology (contrary to studies on vibrotactile acuity, e.g. [28], [22], [29]), since the stimulus used is not suitable for this. Vibrotactile stimuli generated by focal points are not localized enough for such a task, with skin indentation for a single focal point occurring over diameters which are of the same order of magnitude as vibrotactile 2-point thresholds reported in the literature (see Fig.…”

Section: Related Workmentioning

confidence: 99%

Gap Detection in Pairs of Ultrasound Mid-air Vibrotactile Stimuli

Howard

Driller

Frier

et al. 2023

ACM Trans. Appl. Percept.

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Ultrasound mid-air haptic (UMH) devices are a novel tool for haptic feedback, capable of providing localized vibrotactile stimuli to users at a distance. UMH applications largely rely on generating tactile shape outlines on the users’ skin. Here, we investigate how to achieve sensations of continuity or gaps within such 2D curves by studying the perception of pairs of amplitude-modulated (AM) focused ultrasound stimuli. On the one hand, we aim to investigate perceptual effects which may arise from providing simultaneous UMH stimuli. On the other, we wish to provide perception-based rendering guidelines for generating continuous or discontinuous sensations of tactile shapes. Finally, we hope to contribute towards a measure of the perceptually achievable resolution of UMH interfaces. We performed a user study to identify how far apart two focal points need to be in order to elicit a perceptual experience of two distinct stimuli separated by a gap. Mean gap detection thresholds were found at 32.3mm spacing between focal points, but a high within- and between-subject variability was observed. Pairs spaced below 15mm were consistently (>95%) perceived as a single stimulus, while pairs spaced 45mm apart were consistently (84%) perceived as two separate stimuli. To investigate the observed variability, we resort to acoustic simulations of the resulting pressure fields. These show a non-linear evolution of actual peak pressure spacing as a function of nominal focal point spacing. Beyond an initial threshold in spacing (between 15mm and 18mm), which we believe to be related to the perceived size of a focal point, the probability of detecting a gap between focal points appears to linearly increase with spacing. Our work highlights physical interactions and perceptual effects to consider when designing or investigating the perception of UMH shapes.

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Two point vibrotactile spatial resolution as a function of pulse frequency and pulse width

Cited by 5 publications

References 5 publications

Two-point vibrotactile discrimination related to parameters of pulse burst stimulus

Two-point vibrotactile discrimination related to parameters of pulse burst stimulus

Does Multi-Actuator Vibrotactile Feedback Within Tangible Objects Enrich VR Manipulation?

Gap Detection in Pairs of Ultrasound Mid-air Vibrotactile Stimuli

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