Haptic Edge Sharpness Perception with a Contact Location Display

Park, Jaeyoung; Doxon, Andrew J.; Provancher, William R.; Johnson, David E.; Tan, Hong Z.

doi:10.1109/toh.2012.14

Cited by 9 publications

(11 citation statements)

References 40 publications

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“…To relate their findings to those of other studies of curvature discrimination, they expressed curvature discrimination thresholds as Weber fractions, which they calculated as the slope of the best fitting line relating JND to the reference stimulus that passes through the origin. The authors noted that there was a clear trend for Weber fractions from studies like theirs that used virtual stimuli to be higher (0.11 to 0.47 [7], [19], [21]) than studies that used real stimuli (0.08 to 0.11 [18]–[20]). This followed the pattern reported previously by Garcia-Hernandez et al [16] who found an approximate 65% decrease in tactile discrimination thresholds for virtual stimuli compared with real stimuli for sinusoidal gratings, gap distance, and angle inclination.…”

Section: Introductionmentioning

confidence: 97%

“…Thus, understanding the limits of the human haptic system has important engineering and design implications. The study reported here investigates human haptic perception of an object property that has yet to be the subject of much research [6], [7], namely, the sharpness of edges. Specifically, the study examines our ability to discriminate changes in edge sharpness by measuring the just noticeable difference (JND) of edge sharpness, and considers how this is affected by changes in haptic exploration strategy.…”

Section: Introductionmentioning

confidence: 99%

“…If we define an edge as being formed by the juncture of two surfaces, a fundamental property of an edge will be the angle at which these surfaces meet (the apex in two dimensions and the vertex in three dimensions); in a three dimensional shape that property of an edge also relates to the psychological dimension of sharpness . It is therefore surprising that while a considerable number of studies have investigated haptic discrimination of 2D angles [13]–[16] and curved surfaces [17], until recently, very few studies have explicitly investigated discrimination of edge (vertex) sharpness [7].…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have investigated our ability to discriminate the curvature of surfaces using stimuli that are both real [18]–[20] and virtual [7], [19], [21]. In the majority of these studies, the curvature of the test surfaces used was relatively large.…”

Section: Introductionmentioning

confidence: 99%

“…Park and colleagues [7] recently followed this line of logic when testing the discrimination of edge sharpness using a contact location display (CLD). The CLDs are haptic interface devices that enable the haptic exploration of virtual shapes by providing both kinesthetic and cutaneous feedback to the fingertip [19].…”

Section: Introductionmentioning

confidence: 99%

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On the Edge: Haptic Discrimination of Edge Sharpness

et al. 2013

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The increasing ubiquity of haptic displays (e.g., smart phones and tablets) necessitates a better understanding of the perceptual capabilities of the human haptic system. Haptic displays will soon be capable of locally deforming to create simple 3D shapes. This study investigated the sensitivity of our haptic system to a fundamental component of shapes: edges. A novel set of eight high quality shape stimuli with test edges that varied in sharpness were fabricated in a 3D printer. In a two alternative, forced choice task, blindfolded participants were presented with two of these shapes side by side (one the reference, the other selected randomly from the remaining set of seven) and after actively exploring the test edge of each shape with the tip of their index finger, reported which shape had the sharper edge. We used a model selection approach to fit optimal psychometric functions to performance data, and from these obtained just noticeable differences and Weber fractions. In Experiment 1, participants performed the task with four different references. With sharpness defined as the angle at which one surface meets the horizontal plane, the four JNDs closely followed Weber’s Law, giving a Weber fraction of 0.11. Comparisons to previously reported Weber fractions from other haptic manipulations (e.g. amplitude of vibration) suggests we are sufficiently sensitive to changes in edge sharpness for this to be of potential utility in the design of future haptic displays. In Experiment 2, two groups of participants performed the task with a single reference but different exploration strategies; one was limited to a single touch, the other unconstrained and free to explore as they wished. As predicted, the JND in the free exploration condition was lower than that in the single touch condition, indicating exploration strategy affects sensitivity to edge sharpness.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Edge: Haptic Discrimination of Edge Sharpness

et al. 2013

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Introduction

Wang¹,

Xiao²,

Zhang³

2014

Haptic Rendering for Simulation of Fine Manipulation

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Proximal-Distal, Not Medial-Lateral, Movement across an Edge Increases Discrimination of Edge Sharpness

et al. 2014

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Edges are fundamental properties of our environment and the objects we interact with. There is a lack of research on the haptic perception of edges, especially the sharpness of an edge. Skinner et al. [2013 PLoS ONE, 8(9): e73283] found that haptic discriminability of sharpness was clearly superior when using a relatively unrestrained, free exploration strategy compared with a static single touch strategy. In the free exploration condition two distinct movement patterns were frequently used by participants: a proximal-distal movement of the fingerpad across the test edge and a medial-lateral movement of the fingerpad along the test edge. Here, using the same stimuli and two-alternative forced-choice method of constant stimuli as Skinner et al. (2013), we demonstrate that a proximal-distal movement results in substantially lower sharpness discrimination thresholds than a medial-lateral movement. The underlying neurophysiology and implications for the design of haptic displays are considered.

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Haptic Edge Sharpness Perception with a Contact Location Display

Cited by 9 publications

References 40 publications

On the Edge: Haptic Discrimination of Edge Sharpness

On the Edge: Haptic Discrimination of Edge Sharpness

Introduction

Proximal-Distal, Not Medial-Lateral, Movement across an Edge Increases Discrimination of Edge Sharpness

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