Biomechanically Optimized Distributed Tactile Transducer Based on Lateral Skin Deformation

Wang, Qi; Hayward, Vincent

doi:10.1177/0278364909345289

Cited by 69 publications

(47 citation statements)

References 36 publications

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“…Evidence that our display produces stimuli perceptually similar to real objects was provided in ref. [7], where it was shown that subjects could judge of the orientation of slanted lines with an accuracy better than 10 degrees, which is in line with known thresholds in humans [1]. Moreover, the display readily produces phenomena such as tactile apparent motion [2].…”

Section: Resultssupporting

confidence: 66%

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Weak spatial constancy in touch

Wexler

Hayward

2011

2011 IEEE World Haptics Conference

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We propose extending the concept of spatial constancy to haptic perception. In vision, spatial constancy refers to the conversion of retinotopic signals into spatiotopic representations, allowing the observer to perceive space independently of his or her own eye movements, or at least partly so. The problem would seem at least as important in haptic perception, where sensory surfaces undergo even more complex movements in space. Here we develop a methodology for studying haptic spatial constancy, which involves a tactile display mounted on a mobile platform, and which allows us to decouple movements of the sensory surface-in this case the fingertip-from movements of objects on the fingertip. Using this apparatus, we find evidence for only weak haptic spatial constancy.

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Section: Resultssupporting

confidence: 66%

“…We used a tactile display called the Latero (Tactile Labs, tactilelabs.com) that operates by deforming the fingerpad skin with an array of laterally moving pins actuated by miniature piezoelectric bending motors [7]. The display consists of an 8 × 8 array of independent pins within an area of about 1 cm 2 -see Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Weak spatial constancy in touch

Wexler

Hayward

2011

2011 IEEE World Haptics Conference

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“…The tactile stimulus was produced using a Latero Tactile Display (Tactile Labs) (57). This display has an area of 1.2 cm 2 and consists of 8 × 8 pins that can be moved independently in one direction parallel to the surface, with a maximum amplitude of about 0.1 mm and bandwidth of about 100 Hz.…”

Section: Methodsmentioning

confidence: 99%

Direct coupling of haptic signals between hands

Dupin

Hayward

Wexler

2014

Proc. Natl. Acad. Sci. U.S.A.

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Although motor actions can profoundly affect the perceptual interpretation of sensory inputs, it is not known whether the combination of sensory and movement signals occurs only for sensory surfaces undergoing movement or whether it is a more general phenomenon. In the haptic modality, the independent movement of multiple sensory surfaces poses a challenge to the nervous system when combining the tactile and kinesthetic signals into a coherent percept. When exploring a stationary object, the tactile and kinesthetic signals come from the same hand. Here we probe the internal structure of haptic combination by directing the two signal streams to separate hands: one hand moves but receives no tactile stimulation, while the other hand feels the consequences of the first hand's movement but remains still. We find that both discrete and continuous tactile and kinesthetic signals are combined as if they came from the same hand. This combination proceeds by direct coupling or transfer of the kinesthetic signal from the moving to the feeling hand, rather than assuming the displacement of a mediating object. The combination of signals is due to perception rather than inference, because a small temporal offset between the signals significantly degrades performance. These results suggest that the brain simplifies the complex coordinate transformation task of remapping sensory inputs to take into account the movements of multiple body parts in haptic perception, and they show that the effects of action are not limited to moving sensors.touch | haptics | perception | sensorimotor integration | kinesthesis M otor and kinesthetic signals arising from the movement of the eyes in the head, and translation of the eyes and ears in space due to head and body movements, have been shown to play an important role in visual (1-3) and auditory (4-6) perception. However, because of the small number of sensory surfaces in these modalities, and the rigid constraints on their movement, the number of kinesthetic degrees of freedom is limited. In active touch or the haptic modality (7-13), the large number of sensory surfaces, and the nearly unlimited ways these surfaces can move, lead to the question of how movement can be represented and associated with the cutaneous or tactile signals. To study how tactile and kinesthetic cues are combined to haptically perceive object shape and size, we created a novel haptic stimulus in which these cues were completely dissociated. This stimulus consisted of simulated triangles felt through a narrow slit, as in anorthoscopic perception in vision (14-16) or haptic perception (17), and as illustrated in Fig.

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“…These devices are usually made of an array of transducer able to deform locally the skin of the fingertip. Basically two tyoe of working principle can be employed: the normal indentation as described in (Wagner et al, 2004) or lateral deformation (Wang & Hayward, 2010). -Tactile Displays or Surface Properties Displays.…”

Section: Wherementioning

confidence: 99%