A multi-digit tactile motion stimulator

Pei, Yu‐Cheng; Lee, Tsung-Chi; Chang, Ting‐Yu; Ruffatto, Donald; Spenko, Matthew; Bensmaı̈a, Sliman J.

doi:10.1016/j.jneumeth.2014.01.021

Cited by 12 publications

(14 citation statements)

References 38 publications

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“…1a). Motion stimulus was delivered to the fingerpad of the left index finger using the miniature tactile stimulator with three motors that can precisely control the speed, direction and indentation depth of the stimulus 54 (Fig. 1b).…”

Section: Resultsmentioning

confidence: 99%

“…For each participant, the finger, forearm, and head holders were adjusted to ensure between-participant consistency of finger and head postures. For the intensity of tactile stimulation, tactile motion was presented by the miniature tactile motion stimulator 54 (Fig. 1a,b) with indentation depth of 1000 μm, and had the indentation rate of 2 mm/s which was far beyond the sensation threshold of indentation rate (>0.3 mm/s) 78 .…”

Section: Discussionmentioning

confidence: 99%

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Relative posture between head and finger determines perceived tactile direction of motion

Chen

Yeh

Lee

et al. 2020

Sci Rep

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The hand explores the environment for obtaining tactile information that can be fruitfully integrated with other functions, such as vision, audition, and movement. In theory, somatosensory signals gathered by the hand are accurately mapped in the world-centered (allocentric) reference frame such that the multi-modal information signals, whether visual-tactile or motor-tactile, are perfectly aligned. However, an accumulating body of evidence indicates that the perceived tactile orientation or direction is inaccurate; yielding a surprisingly large perceptual bias. To investigate such perceptual bias, this study presented tactile motion stimuli to healthy adult participants in a variety of finger and head postures, and requested the participants to report the perceived direction of motion mapped on a video screen placed on the frontoparallel plane in front of the eyes. Experimental results showed that the perceptual bias could be divided into systematic and nonsystematic biases. Systematic bias, defined as the mean difference between the perceived and veridical directions, correlated linearly with the relative posture between the finger and the head. By contrast, nonsystematic bias, defined as minor difference in bias for different stimulus directions, was highly individualized, phase-locked to stimulus orientation presented on the skin. Overall, the present findings on systematic bias indicate that the transformation bias among the reference frames is dominated by the finger-to-head posture. Moreover, the highly individualized nature of nonsystematic bias reflects how information is obtained by the orientationselective units in the S1 cortex. A hallmark of hand function is to manipulate objects and acquire tactile information, a process denoted as haptics. Furthermore, human manipulation of objects in a series of haptic process requires an integrated neural representation of the body (body schema) and of the space around the body 1-5. When touching an object with hands, we perceive tactile motion 6 that is crucial toward determining the direction 7-11 and speed 8,12,13 of the object, as well as for planning subsequent movements 14. While the tactile motion perceived by the skin of hands is encoded in the somatotopic (skin-centered) reference frame 15,16 , the physical movement of the object is actually represented in the allocentric (or external world-centered) reference frame 17,18. Misalignment between the reference frames frequently causes a bias in perceiving tactile motion 11,19. Therefore, tactile remapping is the outcome of multimodality integration that has been shown to be affected by finger postures 20 , body postures 21 , and transformation of eye-and body-centered reference frames 22,23 , indicating a large-scale transformation and integration involving multiple reference frames 24-27. For example, perceived visual 28 and tactile 29 motion directions can be affected by hand and arm postures 30,31. Studies on temporal integration suggested that multimodal information was processed by a recurrent scheme a...

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Relative posture between head and finger determines perceived tactile direction of motion

Chen

Yeh

Lee

et al. 2020

Sci Rep

Self Cite

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“…In [29], the left right authors also reported a directional bias in the perceived motion direction. That is, their participants perceived two stimuli as parallel when the second motion direction was slightly clockwise with respect to the first -though the effect was not statistically significant.…”

Section: Discussionmentioning

confidence: 94%

Path integration in tactile perception of shapes

Moscatelli

Naceri

Ernst

2014

Behavioural Brain Research

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“…Tactile stimuli were presented using a miniature ball stimulator with different kinds of aluminum balls. The details of the stimulator and stimulus ball have been reported in our previous work (Pei et al, 2014). Briefly, the stimulator consists of individual units that deliver motion with three degrees of freedom: rotation to produce motion, vertical excursion to control the depth of indentation into the skin, and arm orientation to control the direction of motion (Figure 1A).…”

Section: Methodsmentioning

confidence: 99%

Illusory Motion Reversal in Touch

Hsu¹,

Yeh

Huang

et al. 2019

Front. Neurosci.

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Psychophysical visual experiments have shown illusory motion reversal (IMR), in which the perceived direction of motion is the opposite of its actual direction. The tactile form of this illusion has also been reported. However, it remains unclear which stimulus characteristics affect the magnitude of IMR. We closely examined the effect of stimulus characteristics on IMR by presenting moving sinusoid gratings and random-dot patterns to 10 participants’ fingerpads at different spatial periods, speeds, and indentation depths. All participants perceived a motion direction opposite to the veridical direction some of the time. The illusion was more prevalent at spatial periods of 1 and 2 mm and at extreme speeds of 20 and 320 mm/s. We observed stronger IMR for gratings and much weaker IMR for a random-dot pattern, indicating that edge orientation might be a major contributor to this illusion. These results show that the optimal parameters for IMR are consistent with the characteristics of motion-selective neurons in the somatosensory cortex, as most of these neurons are also orientation-selective. We speculate that these neurons could be the neural substrate that accounts for tactile IMR.

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A multi-digit tactile motion stimulator

Cited by 12 publications

References 38 publications

Relative posture between head and finger determines perceived tactile direction of motion

Relative posture between head and finger determines perceived tactile direction of motion

Path integration in tactile perception of shapes

Illusory Motion Reversal in Touch

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