1,452 research outputs found
Leveraging Tendon Vibration to Enhance Pseudo-Haptic Perceptions in VR
Pseudo-haptic techniques are used to modify haptic perception by
appropriately changing visual feedback to body movements. Based on the
knowledge that tendon vibration can affect our somatosensory perception, this
paper proposes a method for leveraging tendon vibration to enhance
pseudo-haptics during free arm motion. Three experiments were performed to
examine the impact of tendon vibration on the range and resolution of
pseudo-haptics. The first experiment investigated the effect of tendon
vibration on the detection threshold of the discrepancy between visual and
physical motion. The results indicated that vibrations applied to the inner
tendons of the wrist and elbow increased the threshold, suggesting that tendon
vibration can augment the applicable visual motion gain by approximately 13\%
without users detecting the visual/physical discrepancy. Furthermore, the
results demonstrate that tendon vibration acts as noise on haptic motion cues.
The second experiment assessed the impact of tendon vibration on the resolution
of pseudo-haptics by determining the just noticeable difference in
pseudo-weight perception. The results suggested that the tendon vibration does
not largely compromise the resolution of pseudo-haptics. The third experiment
evaluated the equivalence between the weight perception triggered by tendon
vibration and that by visual motion gain, that is, the point of subjective
equality. The results revealed that vibration amplifies the weight perception
and its effect was equivalent to that obtained using a gain of 0.64 without
vibration, implying that the tendon vibration also functions as an additional
haptic cue. Our results provide design guidelines and future work for enhancing
pseudo-haptics with tendon vibration.Comment: This paper has been accepted by IEEE TVC
Pseudo-haptics survey: Human-computer interaction in extended reality & teleoperation
Pseudo-haptic techniques are becoming increasingly popular in human-computer interaction. They replicate haptic sensations by leveraging primarily visual feedback rather than mechanical actuators. These techniques bridge the gap between the real and virtual worlds by exploring the brain’s ability to integrate visual and haptic information. One of the many advantages of pseudo-haptic techniques is that they are cost-effective, portable, and flexible. They eliminate the need for direct attachment of haptic devices to the body, which can be heavy and large and require a lot of power and maintenance. Recent research has focused on applying these techniques to extended reality and mid-air interactions. To better understand the potential of pseudo-haptic techniques, the authors developed a novel taxonomy encompassing tactile feedback, kinesthetic feedback, and combined categories in multimodal approaches, ground not covered by previous surveys. This survey highlights multimodal strategies and potential avenues for future studies, particularly regarding integrating these techniques into extended reality and collaborative virtual environments.info:eu-repo/semantics/publishedVersio
Move or Push? Studying Pseudo-Haptic Perceptions Obtained with Motion or Force Input
Pseudo-haptics techniques are interesting alternatives for generating haptic
perceptions, which entails the manipulation of haptic perception through the
appropriate alteration of primarily visual feedback in response to body
movements. However, the use of pseudo-haptics techniques with a motion-input
system can sometimes be limited. This paper investigates a novel approach for
extending the potential of pseudo-haptics techniques in virtual reality (VR).
The proposed approach utilizes a reaction force from force-input as a
substitution of haptic cue for the pseudo-haptic perception. The paper
introduced a manipulation method in which the vertical acceleration of the
virtual hand is controlled by the extent of push-in of a force sensor. Such a
force-input manipulation of a virtual body can not only present pseudo-haptics
with less physical spaces and be used by more various users including
physically handicapped people, but also can present the reaction force
proportional to the user's input to the user. We hypothesized that such a
haptic force cue would contribute to the pseudo-haptic perception. Therefore,
the paper endeavors to investigate the force-input pseudo-haptic perception in
a comparison with the motion-input pseudo-haptics. The paper compared
force-input and motion-input manipulation in a point of achievable range and
resolution of pseudo-haptic weight. The experimental results suggest that the
force-input manipulation successfully extends the range of perceptible
pseudo-weight by 80\% in comparison to the motion-input manipulation. On the
other hand, it is revealed that the motion-input manipulation has 1 step larger
number of distinguishable weight levels and is easier to operate than the
force-input manipulation.Comment: This paper is now under review for IEEE Transactions on Visualization
and Computer Graphic
Examining the size-weight illusion with visuo-haptic conflict in immersive virtual reality.
This is the author accepted manuscript. The final version is available from SAGE Publications via the DOI in this record.When we experience our environment, we do so by combining sensory inputs with expectations derived from our prior knowledge, which can lead to surprising perceptual effects such as small objects feeling heavier than equally weighted large objects (the size-weight illusion (SWI)). Interestingly, there is evidence that the way in which the volume of an object is experienced can affect the strength of the illusion, with a SWI induced by exclusively haptic volume cues feeling stronger than a SWI induced with only visual volume cues. Furthermore, visual cues appear to add nothing over and above haptic size cues in terms of the strength of the induced weight illusion-findings which are difficult to reconcile with work using cue-conflict paradigms where visual cues usually dominate haptic cues. Here, virtual reality was used to place these senses in conflict with one another. Participants ( N = 22) judged the heaviness of identically weighted cylinders across three conditions: (1) objects appeared different sizes but were physically the same size, (2) objects were physically different sizes but appeared to be the same size, or (3) objects which looked and felt different sizes from one another. Consistent with prior work, haptic size cues induced a larger SWI than that induced by visual size differences. In contrast to prior work, however, congruent vision and haptic size cues yielded a larger still SWI. These findings not only add to our understanding of how different modalities combine to influence our hedonic perception but also showcase how virtual reality can develop novel cue-conflict paradigms
物理/バーチャル空間の接続と分離を媒介する可動壁に関する研究
Tohoku University博士(情報科学)thesi
Perceiving and acting upon weight illusions in the absence of somatosensory information
This is the author accepted manuscript. The final version is available from the American Physiological Society via the DOI in this record.When lifting novel objects, individuals’ fingertip forces are influenced by a variety of cues such as volume and apparent material. This means that heavy-looking objects tend to be lifted with more force than lighter-looking objects, even when they weigh the same amount as one another. Expectations about object weight based on visual appearance also influence how heavy an object feels when it is lifted. For instance, in the "size-weight illusion," small objects feel heavier than equally weighted large objects. Similarly, in the "material-weight illusion," objects that seem to be made from light-looking materials feel heavier than objects of the same weight that appear to be made from heavy-looking materials. In this study, we investigated these perceptual and sensorimotor effects in IW, an individual with peripheral deafferentation (i.e., a loss of tactile and proprioception feedback). We examined his perceptions of heaviness and fingertip force application over repeated lifts of objects that varied in size or material properties. Despite being able to report real weight differences, IW did not appear to experience the size- or material-weight illusions. Furthermore, he showed no evidence of sensorimotor prediction based on size and material cues. The results are discussed in the context of forward models and their possible influence on weight perception and fingertip force control
A Systematic Review of Weight Perception in Virtual Reality: Techniques, Challenges, and Road Ahead
Weight is perceived through the combination of multiple sensory systems, and a wide range of factors – including touch, visual, and force senses – can influence the perception of heaviness. There have been remarkable advancements in the development of haptic interfaces throughout the years. However, a number of challenges limit the progression to enable humans to sense the weight in virtual reality (VR). This article presents an overview of the factors that influence how weight is perceived and the phenomenon that contributes to various types of weight illusions. A systematic review has been undertaken to assess the development of weight perception in VR, underlying haptic technology that renders the mass of a virtual object, and the creation of weight perception through pseudo-haptic. We summarize the approaches from the perspective of haptic and pseudo-haptic cues that exhibit the sense of weight such as force, skin deformation, vibration, inertia, control–display ratio, velocity, body gestures, and audio–visual representation. The design challenges are underlined, and research gaps are discussed, including accuracy and precision, weight discrimination, heavyweight rendering, and absolute weight simulation. This article is anticipated to aid in the development of more realistic weight perception in VR and stimulated new research interest in this topic
Task Dynamics of Prior Training Influence Visual Force Estimation Ability During Teleoperation
The lack of haptic feedback in Robot-assisted Minimally Invasive Surgery
(RMIS) is a potential barrier to safe tissue handling during surgery. Bayesian
modeling theory suggests that surgeons with experience in open or laparoscopic
surgery can develop priors of tissue stiffness that translate to better force
estimation abilities during RMIS compared to surgeons with no experience. To
test if prior haptic experience leads to improved force estimation ability in
teleoperation, 33 participants were assigned to one of three training
conditions: manual manipulation, teleoperation with force feedback, or
teleoperation without force feedback, and learned to tension a silicone sample
to a set of force values. They were then asked to perform the tension task, and
a previously unencountered palpation task, to a different set of force values
under teleoperation without force feedback. Compared to the teleoperation
groups, the manual group had higher force error in the tension task outside the
range of forces they had trained on, but showed better speed-accuracy functions
in the palpation task at low force levels. This suggests that the dynamics of
the training modality affect force estimation ability during teleoperation,
with the prior haptic experience accessible if formed under the same dynamics
as the task.Comment: 12 pages, 8 figure
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