Discrepant findings on the degree of eye-hand coupling suggest its dependence on the task. One task characteristic modulating this coupling may be the relevance of certain target attributes for each motor system. We tested this assumption by comparing eye and hand movements towards targets of different haptic texture, a target attribute which is behaviourally relevant only to the hand, not the eye. Pointing to a slippery target (fur) resulted in longer hand movement time than to a rougher target (sandpaper). This effect was due to an increased ratio of time spent in deceleration. In contrast, eye movement time was invariant across different haptic target textures. Thus, information about target texture is used differently by eye and hand.
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http://dx.doi.org/10.1097/00001756-200303030-00034 | DOI Listing |
Fingertip friction is a key component of tactile perception. In active tactile exploration, friction forces depend on the applied normal force and on the sliding speed chosen. We have investigated whether humans perceive the speed dependence of friction for textured surfaces of materials, which show either increase or decrease of the friction coefficient with speed.
View Article and Find Full Text PDFPNAS Nexus
October 2024
Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843, USA.
Acta Psychol (Amst)
October 2024
Baruch Ivcher School of Psychology, Reichman University, Herzliya, Israel; Department of Psychology, Palo Alto University, Palo Alto, CA, USA. Electronic address:
Experiencing and remembering objects using the sense of touch is an important aspect of our interactions with our environment, but the cognitive processes of long-term tactile memory for surface textures have not previously been studied. We administered a novel tactile texture memory span task, which required participants to identify new textures among a constantly increasing set of previously experienced stimuli. Performance on that task was compared to a span task employing novel visual objects.
View Article and Find Full Text PDFACS Appl Mater Interfaces
October 2024
Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
Electrovibration haptic technology, which provides tactile feedback to users by swiping the surface with a finger via electroadhesion, shows promise as a haptic feedback platform for displays owing to its simple structure, ease of integration with existing displays, and simple driving mechanism. However, without electrical grounding on a user's body, the frequent requirement of a high driving voltage near 50 V limits the use of electrovibration haptic technology in practical display applications. This study introduces materials and fabrication strategies that considerably reduce the driving voltage.
View Article and Find Full Text PDFSci Adv
September 2024
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea.
Shape-morphing displays alter their surface geometry to convey information through three-dimensional shapes. However, rapid transformation into seamless shapes with multimodal tactile sensations poses challenges. Here, we introduce a versatile soft shape-morphing and tactile display, using a novel actuator that combines a PVC gel composite, dielectric liquid, and an electrode array.
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