Tactile sensing enables high-precision 3D shape perception when vision is limited.However,tactilebased shape reconstruction remains a challenging problem.In this paper,a novel visuotactile sensor,GelStereo Palm 2.0,is...Tactile sensing enables high-precision 3D shape perception when vision is limited.However,tactilebased shape reconstruction remains a challenging problem.In this paper,a novel visuotactile sensor,GelStereo Palm 2.0,is proposed to better capture 3D contact geometry.Leveraging the dense tactile point cloud captured by GelStereo Palm 2.0,an active shape reconstruction pipeline is presented to achieve accurate and efficient 3D shape reconstruction on irregular surfaces.GelStereo Palm 2.0 achieves a spatial resolution of 1.5 mm and a reconstruction accuracy of 0.3 mm.The accuracy of the proposed active shape reconstruction pipeline reaches 2.3 mm within 18 explorations.The proposed method has potential applications in the shape reconstruction of transparent or underwater objects.展开更多
Many studies have investigated the evidence for tactile and visual interactive responses to activation of various brain regions.However,few studies have reported on the effects of visuo-tactile multisensory integratio...Many studies have investigated the evidence for tactile and visual interactive responses to activation of various brain regions.However,few studies have reported on the effects of visuo-tactile multisensory integration on the amount of brain activation on the somatosensory cortical regions.The aim of this study was to examine whether coincidental information obtained by tactile stimulation can affect the somatosensory cortical activation using functional MRI.Ten right-handed healthy subjects were recruited for this study.Two tasks（tactile stimulation and visuotactile stimulation）were performed using a block paradigm during f MRI scanning.In the tactile stimulation task,in subjects with eyes closed,tactile stimulation was applied on the dorsum of the right hand,corresponding to the proximal to distal directions,using a rubber brush.In the visuotactile stimulation task,tactile stimulation was applied to observe the attached mirror in the MRI chamber reflecting their hands being touched with the brush.In the result of SPM group analysis,we found brain activation on the somatosensory cortical area.Tactile stimulation task induced brain activations in the left primary sensory-motor cortex（SM1）and secondary somatosensory cortex（S2）.In the visuo-tactile stimulation task,brain activations were observed in the both SM1,both S2,and right posterior parietal cortex.In all tasks,the peak activation was detected in the contralateral SM1.We examined the effects of visuo-tactile multisensory integration on the SM1 and found that visual information during tactile stimulation could enhance activations on SM1 compared to the tactile unisensory stimulation.展开更多
基金supported in part by the National Key Research and Development Program of China(2023YFB4705000)in part by the National Natural Science Foundation of(62303455,62273342,and 62122087)in part by Beijing Natural Science Foundation(L233006).
文摘Tactile sensing enables high-precision 3D shape perception when vision is limited.However,tactilebased shape reconstruction remains a challenging problem.In this paper,a novel visuotactile sensor,GelStereo Palm 2.0,is proposed to better capture 3D contact geometry.Leveraging the dense tactile point cloud captured by GelStereo Palm 2.0,an active shape reconstruction pipeline is presented to achieve accurate and efficient 3D shape reconstruction on irregular surfaces.GelStereo Palm 2.0 achieves a spatial resolution of 1.5 mm and a reconstruction accuracy of 0.3 mm.The accuracy of the proposed active shape reconstruction pipeline reaches 2.3 mm within 18 explorations.The proposed method has potential applications in the shape reconstruction of transparent or underwater objects.
基金supported by the National Research Foundation of Korea(NRF)Grant funded by the Korean Government(MSIP)(NRF-2015R1A5A7037508)the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.2017R1D1A1B03033985)
文摘Many studies have investigated the evidence for tactile and visual interactive responses to activation of various brain regions.However,few studies have reported on the effects of visuo-tactile multisensory integration on the amount of brain activation on the somatosensory cortical regions.The aim of this study was to examine whether coincidental information obtained by tactile stimulation can affect the somatosensory cortical activation using functional MRI.Ten right-handed healthy subjects were recruited for this study.Two tasks（tactile stimulation and visuotactile stimulation）were performed using a block paradigm during f MRI scanning.In the tactile stimulation task,in subjects with eyes closed,tactile stimulation was applied on the dorsum of the right hand,corresponding to the proximal to distal directions,using a rubber brush.In the visuotactile stimulation task,tactile stimulation was applied to observe the attached mirror in the MRI chamber reflecting their hands being touched with the brush.In the result of SPM group analysis,we found brain activation on the somatosensory cortical area.Tactile stimulation task induced brain activations in the left primary sensory-motor cortex（SM1）and secondary somatosensory cortex（S2）.In the visuo-tactile stimulation task,brain activations were observed in the both SM1,both S2,and right posterior parietal cortex.In all tasks,the peak activation was detected in the contralateral SM1.We examined the effects of visuo-tactile multisensory integration on the SM1 and found that visual information during tactile stimulation could enhance activations on SM1 compared to the tactile unisensory stimulation.
