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181 results for “Tactile”
Precise and stable edge orientation signaling by human first-order tactile neurons
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Spike-timing based coding in neuromimetic tactile system enables dynamic object classification
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Sighting, group composition, and tactile exchange for a study on Atlantic spotted dolphins around Bimini, The Bahamas
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Data from: Effects of aging and idiopathic Parkinson's disease on tactile temporal order judgment
It is generally accepted that the basal ganglia play an important role in interval timing that requires the measurement of temporal durations. By contrast, it remains controversial whether the basal ganglia play an essential role in temporal order judgment (TOJ) of successive stimuli, a behavior that does not necessarily require the measurement of durations in time. To address this issue, we compared the effects of idiopathic Parkinson's disease (PD) on the TOJ of two successive taps delivered to each hand, with the arms uncrossed in one condition and crossed in another. In addition to age-matched elderly participants without PD (non-PD), we examined young healthy participants so that the effect of aging could serve as a control for evaluating the effects of PD. There was no significant difference between PD and non-PD participants in any parameter of TOJ under either arm posture, although reaction time was significantly longer in PD compared with non-PD participants. By contrast, the effect of aging was apparent in both conditions. With their arms uncrossed, the temporal resolution (the interstimulus interval that yielded 84% correct responses) in elderly participants was significantly worse compared with young participants. With their arms crossed, elderly participants made more errors at longer intervals (~1 s) than young participants, although both age groups showed similar judgment reversal at moderately short intervals (~200 ms). These results indicate that the basal ganglia and dopaminergic systems do not play essential roles in tactile TOJ involving both hands and that the effect of aging on TOJ is mostly independent of the dopaminergic systems.
Enhancement and suppression of tactile signals during reaching
<p>The perception of tactile stimuli presented on a moving hand is systematically suppressed. Such suppression has been attributed to the limited capacity of the brain to process task-irrelevant sensory information. Here, we examined whether humans do not only suppress movement-irrelevant but also enhance in parallel movement-relevant tactile signals when performing a goal-directed reaching movement. Participants reached to either a visual (LED) or somatosensory target (thumb or index finger of their unseen static hand) and discriminated two simultaneously presented tactile stimuli: a reference stimulus on the little finger of their static hand and a comparison stimulus on the index finger of their moving hand. Thus, during somatosensory reaching the location of the reference stimulus was task-relevant. Tactile suppression, as reflected by the increased points-of-subjective-equality (PSE) and just-noticeable-differences (JND), was stronger during reaching to somatosensory than visual targets. In experiment 2, we presented the reference stimulus at a task-irrelevant location (sternum) and found similar suppression for somatosensory and visual reaching. This suggests that participants enhanced the sensation of the reference stimulus at the target hand during somatosensory reaching in experiment 1. This suggestion was confirmed in experiment 3 using a detection task in which we found lower detection thresholds on the target hand during somatosensory but not during visual reaching. We postulate that humans can flexibly modulate their tactile sensitivity by suppressing movement-irrelevant and enhancing movement-relevant signals in parallel when executing a reaching movement.</p>
Spatial specificity of tactile enhancement during reaching
<p>Tactile signals on a hand that serves as movement goal are enhanced during movement planning and execution. Here, we examined how spatially specific tactile enhancement is when humans reach to their own static hand. Participants discriminated two brief and simultaneously presented tactile stimuli: a comparison stimulus on the left thumb or little finger from a reference stimulus on the sternum. Tactile stimuli were presented either during right-hand reaching towards the left thumb or little finger, or while holding both hands still (baseline). Consistent with our previous findings, stimuli on the left hand were perceived stronger during movement than baseline. However, tactile enhancement was not stronger when the stimuli were presented on the digit that served as reach target, thus the perception across the whole hand was uniformly enhanced. In experiment 2, we also presented stimuli on the upper arm in half of the trials to reduce the expectation of the stimulus location. Tactile stimuli on the target hand, but not on the upper arm, were generally enhanced, supporting the idea of a spatial gradient of tactile enhancement. Overall, our findings argue for low spatial specificity of tactile enhancement at movement-relevant body parts, here the target hand.</p>
Dataset for Exploratory motion guided roobtic tactile insertion
<p>This the dataset for our research project, Exploratory motion guided roobtic tactile insertion.</p> <p>Four objects are 3d printed with basic shape, Each trail is named with insertion direction and distance w.r.t. the known hole center.</p> <p>If you have more questions, feel free to contact at yangang@fji.waseda.jp or yg19930918@gmail.com. </p>
Dynamic Tactility by Position-Encoded Spike Spectrum
<p>Title: Dynamic Tactility by Position-Encoded Spike Spectrum<br> Authors: Taeyeong Kim1, Jaehun Kim2, Insang You3, Joosung Oh1, Sung-Phil Kim2*, Unyong Jeong1*<br> Affiliations:<br> 1 Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea<br> 2 Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea<br> 3 Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea<br> *Corresponding authors: spkim@unist.ac.kr, ujeong@postech.ac.kr </p>
Sighting data and tactile events logged from mixed-group underwater interactions
<p>Interactions between mammalian social groups are generally antagonistic as individuals in groups cooperate to defend resources from non-members. Members of the family Delphinidae inhabit a three-dimensional habitat where resource defense is usually impractical. Here, we describe a long-term partial fusion of two communities of Atlantic spotted dolphins (<i>Stenella frontalis</i>). The northern community, studied for 30 years, immigrated 160 km to the range of the southern community, observed for 20 years. Both communities featured fission-fusion grouping patterns, strongest associations between adult males, and frequent affiliative contact between individuals. For the five-year period following the immigration, we found members of all age classes and both sexes in mixed groups, but there was a strong bias toward finding immigrant males in mixed groups. Some association levels between males, and males and females, from different communities were as high as the highest within-community associations. Affiliative contacts indicate that these individuals were forming bonds, likely for future mating opportunities. The mixing of two separate social groups with new bond formation is rare in terrestrial mammal groups. Such mixing between spotted dolphin groups suggests that adaptations to respond aggressively to 'outsiders' is diminished in this species and possibly other ecologically similar dolphins.</p>
Raw Data and Video of: "A Novel Device Decoupling Tactile Slip and Hand Motion in Reaching Tasks: The HaptiTrack Device"
<p>Hand reaching is a complex task that requires the integration of multiple sensory information from muscle, joints and the skin, and an internal model of the motor command. Recent studies in neuroscience highlighted the important role of touch for the control of hand movement while reaching for a target. In this article, present a novel device, the HaptiTrack device, to physically decouple tactile slip motion and hand movements. The new device generates precisely controlled 2D motion of a contact plate, measures contact forces, and provides hand and finger tracking through an external tracking system. By means of a control algorithm described in this manuscript, the velocity of tactile slip can be changed independently from the velocity of the hand sliding on the device's surface. Due to these multiple features, the device can be a powerful tool for the evaluation of tactile sense during hand reaching movements in healthy and pathological conditions.</p> <p>The video shows the device in four different gain conditions along the x and the y axis. The PDF shows scatterplot of the actual tactile-tool position versus the required tactile-tool position, for each axis.</p>
Skin stretch modulates tactile distance perception without central correction mechanisms
<p>Data and analysis code accompanying the manuscript.</p>
Data from: Escaping blood-fed malaria mosquitoes minimize tactile detection without compromising on take-off speed
To escape after taking a blood meal, a mosquito must exert forces sufficiently high to take off when carrying a load roughly equal to its body weight, while simultaneously avoiding detection by minimizing tactile signals exerted on the host's skin. We studied this trade-off between escape speed and stealth in malaria mosquitoes, Anopheles coluzzii, using 3D motion analysis of high-speed stereoscopic videos of mosquito take-offs and aerodynamic modelling. We found that during the push-off phase, mosquitoes enhanced take-off speed by using aerodynamic forces generated by the beating wings in addition to leg-based push-off forces, whereby wing forces contributed 61% to the total push-off force. Exchanging leg-derived push-off forces for wing-derived aerodynamic forces allows the animal to reduce peak force production on the host's skin. By slowly extending their long legs throughout the push-off, mosquitoes spread push-off forces over a longer time window than insects with short legs, thereby further reducing peak leg forces. Using this specialized take-off behavior, mosquitoes are capable of reaching take-off speeds comparable to those of similarly-sized fruit flies, but with weight-normalized peak leg forces that were only 27% of those of the fruit flies. By limiting peak leg forces, mosquitoes possibly reduce the chance of being detected by the host. The resulting combination of high take-off speed and low tactile signals on the host might help increase the mosquito's success to escape from blood-hosts, which consequently also increases the chance that they transmit vector-borne diseases, such as malaria, to future hosts.
Different mechanisms of magnitude and spatial representation for tactile and auditory modalities
<p>Dataset for Different mechanisms of magnitude and spatial representation for tactile and auditory modalities</p>
Qu'est-ce qu'une interface tactile ?
<p>Une vidéo expliquant ce qu'est une interface tactile.</p>
Development Study Using Vaginal Tactile Imager
ClinicalTrials.gov study NCT01111916. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Tactile and Kinaesthetic Stimulation in Neonates With Hyperbilirubinaemia
ClinicalTrials.gov study NCT05077787. IPD Sharing: NO. Countries: 1. Publications: 4.
Effect of Tactile-Kinesthetic Stimulation on Preterm Neonates
ClinicalTrials.gov study NCT04807088. IPD Sharing: NO. Countries: 1. Publications: 17.
Neuroplasticity in Blind Subjects After Repetitive Tactile Stimulation
ClinicalTrials.gov study NCT01754103. IPD Sharing: Not stated. Countries: 1. Publications: 22.
Feasibility and Efficacy of Assisstive Tactile and Auditory Communicating Devices
ClinicalTrials.gov study NCT03174314. IPD Sharing: UNDECIDED. Countries: 2. Publications: 1.
Effects of Tactile Massage in Long-Term Care Facilities
ClinicalTrials.gov study NCT05052138. IPD Sharing: NO. Countries: 1. Publications: 6.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.