Proprioceptive Sense Research Articles

A broad variety account of infantile need-experiences

AbstractThe article argues that young infants’ felt needs are articulated and discernible experiences. So, instead of undifferentiated feelings, young infants have some sort of variety of need-experiences. In the article, infantile needs are specified as feelings of dissatisfaction. The article argues against the view that instances of dissatisfying feelings would be initially experienced by the infants as undifferentiated feelings of discomfort despite corresponding to a variety of observable behaviors and postures (related to, for instance, hunger, thirst, restlessness, or seeking attachment). Two arguments are brought forth in the article. The embodiment argument claims that feelings of dissatisfaction must be thought as embodied experiences. The experiential sense of these feelings involves as a constituent part a proprioceptive sense of one’s body. As embodied experiences, then, these feelings are specific and varying. The ontogenetic argument suggests that the development of the feelings of dissatisfaction issued by care-interventions can be better understood, if these feelings entail a sort of rudimentary experiential organization from the start. Thus, the article suggests that there is no “single general-purpose model” of the infant’s need-experiences, as some emotion theorists suggest with respect to emotions. This has implications with respect to developmental theories which account for young infants’ experiences of needs and their satisfaction, such as that of Donald Winnicott.

Interrelationship between Multichannel Sound Formats and the “Embodiment” in Cinema

The article investigates the connection between the use of multichannel sound formats and the development of film theory: in particular, the ability of surround sound to “immerse” the viewer in the narrative universe, evoking proprioceptive sensations with sound which gives a new impetus to the theory of “embodiment” developing in the paradigm of phenomenological aesthetics. New sound films not only put the viewer into a new acoustic environment, but also create parallel universes represented by sound and identified by the viewer as “material”, capable of not only causing a reaction, but also “finalizing” the image in the minds of viewers. Technological innovations in sound recording and sound reproduction due to the introduction of multichannel systems have led to the transformation of auditory perception and the emergence of an entirely new type of acoustic space. With film sound becoming more multi-layered and omnidirectional, the auditory component has been elaborated with synthesized textures as a result of sound design. The aesthetic potential and expressiveness of the “format” sound has broken a new ground in the progress of virtual reality in film and affected the viewer’s artistic perception of the latest works of screen art as well as the development of new theoretical ideas.

Association of Functional Mobility with Knee Proprioception in Knee Osteoarthritis Patients

Background: Knee osteoarthritis (OA), the most common arthritis type, causes pain and limits daily activities, especially in older adults. Age-related declines in proprioception and joint position sense increase joint load and impair neuromuscular control. This cross-sectional study examined the relationship between functional mobility and knee proprioception in OA patients, aiming to clarify their impact on treatment and mobility outcomes. Methods: A total of 33 participants were enrolled in this cross-sectional study based on the inclusion criteria. Functional mobility was assessed using three clinical measures: the Stair Climb Test (SCT), the 6-Minute Walk Test (6MWT), and the Five Times Sit to Stand Test (FTSST). Participants completed an initial trial of the 6MWT, and proprioception error was measured using a digital inclinometer. The FTSST and SCT were repeated three times after the first trial, with participants sitting high and holding for 5 seconds between each trial, returning to full knee extension before starting again. Results: Karl Pearson Correlation test demonstrated that there was a statistically significant moderately negative correlation was found between the FTSST and proprioception error (r=-0.444: p<0.05). There was a positive correlation between 6MWT and proprioception error (r=+0.132: p>0.05) and a low negative correlation between the SCT and proprioception errors (r=-0.018: p>0.05) but was not statistically significant. Conclusion: The study indicated that reduced physical mobility impairs proprioception, potentially contributing to or resulting from OA. It concluded that individuals with knee osteoarthritis had greater proprioception errors, with lower physical performance correlating to more pronounced proprioceptive deficits.

Comparison of head posture and neck proprioceptive sense of individuals with chronic neck pain and healthy controls: A cross-sectional study.

Chronic pain can affect body perception at the central level by causing the somatosensory cortex to rearrange. Additionally, cervical afferent abnormalities in individuals with neck pain can impair proprioceptive sensitivity, potentially leading to alterations in body alignment and biomechanics. Nevertheless, there are insufficient studies exploring these notions. The main objective of this study was to compare the head posture and neck proprioceptive sense of individuals with chronic neck pain and healthy controls. Utilizing a cross-sectional study, a total of 76 volunteers comprising 38 individuals with neck pain and 38 matched healthy controls participated in the study. Head posture and cervical joint position sense were measured using a Cervical Range of Motion Deluxe (CROM) device. Firstly, the deviation angles of the head in three planes were evaluated, then the Head Repositioning Accuracy (HRA) test was performed to determine the joint position error. Visual Analogue Scale (VAS) was used to determine the severity of pain in individuals with neck pain. The deviation angles of the head in all three planes were significantly lower in the healthy control group (p< 0.05). Joint position error values were significantly higher in all directions (flexion-extension, right-left lateral flexion, and rotation) in the neck pain group (p< 0.001). The findings show that the proprioceptive sensation of the cervical region in individuals with neck pain was adversely affected, with changes were observed in the head posture. The abstract of this study was presented as a verbal declaration at the International Congress of Health Sciences-ICHES-IDU 2020 that was held in İzmir on 20-21 June 2020.

Tractography analysis results of the trigeminus nerve, which contains fibers responsible for proprioception sensation and motor control in Adolescent Idiopathic Scoliosis.

Cross-sectional Study. It is not yet clear whether the loss of proprioceptive sensation and muscle weakness seen in adolescent idiopathic scoliosis (AIS) is the result of central nervous system dysfunction or secondary to spinal deformity. In our study, in order to find an answer to this question, we examined the microarchitecture of the nervus trigeminus, which is least affected by spinal deformity and contains both proprioceptive sensory and motor fibers. In this single-center, cross-sectional cohort study, 40 Lenke Type 3 (27 female, 13 male) AIS patients and 40 (25 female, 15 male) healthy individuals between the ages of 10-18 years. Tractography of the nervus trigenimus was performed using the "DSI Studio" program. The volumes of the targeted musculus pterygoideus lateralis and musculus pterygoideus medialis were measured using the Insight Segmentation and Registration Tool Kit (ITK -SNAP) program. The data were evaluated using the Statistical Package for the Social Sciences 22.0 program for Windows. There was no significant difference between the two groups in terms of baseline characteristics (p˃0.05). Left nervus trigeminus fiber number and fiber ratio were significantly higher in the control group compared to the scoliosis group p < 0.05. Right and left lateral pterygoid muscle showed lower volume and volume percentage in the scoliosis group compared to the control group (p < 0.05). According to the study data, proprioceptive sensory and motor control dysfunction in AIS is predicted to develop independently of spinal deformity.

Degeneración combinada subaguda de la médula y gastritis atrófica: revisión de la literatura

Introduction: Subacute combined degeneration of the spinal cord is a consequence of vitamin B12 deficiency. Its clinical presentation includes paresthesia, and proprioception and vibratory sensation loss, which can become disabling. Case presentation: we report the case of an elderly patient who experienced initial paresthesia which progressed to paraparesis, as well as some memory loss. Based on his physical examination a diagnostic impression of myelitis was made. Further investigation evidenced cyanocobalamin deficiency. Conclusion: patient was treated with vitamin B12 supplementation, obtaining an adequate response. There are numerous causes of vitamin B12 deficiency, however, its treatment is simple, and its early initiation can prevent severe neurological symptoms leading to disability.

Virtual reality-brain computer interface hand function enhancement rehabilitation system incorporating multi-sensory stimulation

Stroke is an acute cerebrovascular disease in which sudden interruption of blood supply to the brain or rupture of cerebral blood vessels cause damage to brain cells and consequently impair the patient's motor and cognitive abilities. A novel rehabilitation training model integrating brain-computer interface (BCI) and virtual reality (VR) not only promotes the functional activation of brain networks, but also provides immersive and interesting contextual feedback for patients. In this paper, we designed a hand rehabilitation training system integrating multi-sensory stimulation feedback, BCI and VR, which guides patients' motor imaginations through the tasks of the virtual scene, acquires patients' motor intentions, and then carries out human-computer interactions under the virtual scene. At the same time, haptic feedback is incorporated to further increase the patients' proprioceptive sensations, so as to realize the hand function rehabilitation training based on the multi-sensory stimulation feedback of vision, hearing, and haptic senses. In this study, we compared and analyzed the differences in power spectral density of different frequency bands within the EEG signal data before and after the incorporation of haptic feedback, and found that the motor brain area was significantly activated after the incorporation of haptic feedback, and the power spectral density of the motor brain area was significantly increased in the high gamma frequency band. The results of this study indicate that the rehabilitation training of patients with the VR-BCI hand function enhancement rehabilitation system incorporating multi-sensory stimulation can accelerate the two-way facilitation of sensory and motor conduction pathways, thus accelerating the rehabilitation process.

Innervation of the human sternoclavicular joint.

The sternoclavicular joint (SCJ) functions as the basal joint of the entire upper limb and must move in the proper pattern for normal scapular motion. Afferent sensations from joints, such as proprioception and pain sensation, are important for maintaining the proper motion and condition of joints. Detailed anatomical data are useful for discussing injuries or surgeries that impair the afferent nerve to the SCJ. Nerve branches to SCJs were examined on 12 sides, and the subclavian nerve was investigated on six sides to clarify whether it innervates this joint. On seven of the 12 sides, the SCJ was innervated by two nerves, (1) a branch from the medial supraclavicular nerve that ran medially along the clavicle and (2) a branch from the lateral pectoral nerve that innervated the clavicular head and upper part of the sternocostal head of the pectoralis major. This branch ran medially behind the clavicular head of the pectoralis major and reached the SCJ. In the remaining five sides, the SCJ was innervated solely by the branch from the medial supraclavicular nerve. Subclavian nerves ended within the subclavius muscle or periosteum of the clavicle and were separate from the SCJs. Our data on the route of nerve branches to the SCJ suggest that injury or surgery, such as clavicle fracture or resection of the clavicular head of the pectoralis major for myocutaneous flap transfer, can impair the SCJ's afferent nerve supply.

Therapeutic idea for post-stroke foot inversion with Cixi Tongshu method combined with rehabilitation training

Based on the function of xi-cleft points and shu-streams points and in association with the anatomic structure where the acupoints are located, Cixi (stimulating meridian qi at xi-cleft points) is used for regulating the physical appearance, while Tongshu (promoting the qi circulation of shu-stream points) is for regulating the spirit. The depth and direction of needle insertion are controlled and deqi is determined by muscle twitching so as to relax the muscles. Rehabilitation training is combined to restore the foot proprioceptive sensibility. The above comprehensive method co-works on correcting post-stroke foot inversion and recovering walking ability in the patients.

Proprioceptive Sensation Levels of The Elbows of Physically Disabled Athletes.

The aim of this study was to compare elbow joint proprioception measurements between physically disabled individuals who are active in sports and those who are not. The study included 30 athletes, 30 sedentary individuals, 30 physically disabled athletes, and 30 physically disabled sedentary individuals as volunteers. Elbow joint proprioception measurements were conducted using a sensitive digital goniometer with a precision of 1 degree. The joint position sense test method was used to perform the active angle repetition technique. Target angles were determined to be 30°, 60°, and 120°. A significant difference was observed in the comparison of proprioception between the dominant and non-dominant elbow joints of athletes and physically disabled sedentary individuals (p<0.05). Elbow joint proprioception was found to be highest in physically disabled athletes at the target angles. Conversely, the lowest elbow joint proprioception levels were found in physically disabled sedentary patients compared with the other groups.

The relationship between single leg balance and proprioception of the knee joint in individuals with non-specific chronic back pain

BackgroundProprioceptive information from the hips, knees, and ankles as well as joint coordination are important for maintaining and controlling balance. Regional receptors in the muscles, joints, skin, and tendons as well as proprioception in the knee joint provide the necessary joint activity and stability. Pain may occur with a decreased sense of balance and proprioception. ObjectiveTo investigate the relationship between single-leg balance and proprioception of the knee joint in individuals with non-specific chronic low back pain. DesignFifty-two individuals with non-specific chronic low back pain, 30 females and 22 males, were included in our study, with a range of 18–50 years (mean age:25.15 ± 8.2 years). MethodPain intensity at rest and activity was assessed using Visual Analogue Scale (VAS), and disability and function were assessed using Oswestry Disability Index (ODI). Single-leg balance measurements were performed using Prokin TecnoBody kinematic balance device. A goniometer was used to evaluate the proprioception of the knee joint. ResultsThere were low-level negative correlations between VAS resting pain intensity and medium-lateral standard deviation value (p = 0.018; r = −0.327) and ellipse area measure (p = 0.039; r = −0.287) from static balance assessments. There were low-level negative correlations between VAS activity pain intensity and medium-lateral standard deviation value (p = 0.039; r = −0.288), ellipse area (p = 0.044; r = −0.281), and perimeter measure (p = 0.043; r = −0.282) from static balance assessments. No correlation was seen between ODI and clinical balance and proprioception assessments (p > 0.05). There was no correlation between clinical balance and proprioception evaluations (p > 0.05). ConclusionAs a result of the study, it was decided that there is a minimal relationship between single-leg balance and knee joint proprioception in people with nonspecific low back pain.

Galacturonic acid-capsaicin prodrug for prolonged nociceptive-selective nerve blockade

There is an urgent clinical need to develop nerve-blocking agents capable of inducing long duration sensory block without muscle weakness or paralysis to treat post-operative and chronic pain conditions. Here, we report a galacturonic acid-capsaicin (GalA-CAP) prodrug as an effective nociceptive-selective axon blocking agent. Capsaicin selectively acts on nociceptive signaling without motor nerve blockade or disruption of proprioception and touch sensation, and the galacturonic acid moiety enhance prodrug permeability across the restrictive peripheral nerve barriers (PNBs) via carrier-mediated transport by the facilitative glucose transporters (GLUTs). In addition, following prodrug transport across PNBs, the inactive prodrug is converted to active capsaicin through linker hydrolysis, leading to sustained drug release. A single injection of GalA-CAP prodrug at the sciatic nerves of rats led to nociceptive-selective nerve blockade lasting for 234 ± 37 h, which is a sufficient duration to address the most intense period of postsurgical pain. Furthermore, the prodrug markedly mitigated capsaicin-associated side effects, leading to a notable decrease in systemic toxicity, benign local tissue reactions, and diminished burning and irritant effects.

Investigation of the Effects of Posture and Proprioception Sense on Balance and Gait

The aim of this research is to evaluate the effects of individual differences in head posture, balance parameters, and proprioception on balance and gait in asymptomatic individuals. The research was conducted with 111 participants. Balance and walking ability, range of motion of the cervical spine, body posture, proprioception sense, and both static and dynamic balance assessments were carried out. The relationship of the Timed Up and Go Test with various independent variables such as head forward tilt, proprioceptive error, Flamingo Test score, Functional Reach Test score, and Y Balance Test score was examined. There was a significant negative correlation between the Timed Up and Go Test score and the Functional Reaching Test score and the Y Balance Test score at p = 0.05 statistical significance level. Multiple regression analysis was used to identify variables predicting balance and gait performance. The results showed that there is no statistically significant relationship between the Timed Up and Go Test score and any of the predictive variables. The findings indicated that impairments in upper extremity reaching capacity and particular aspects of dynamic equilibrium could potentially be associated with the prolonged duration of the Timed Up and Go Test. The aforementioned discoveries hold significance for evaluating and restoring the physical abilities of people with mobility limitations.

The Effects of Kinesiotape on the Thickness of the Long Head of the Biceps Tendon in Athletes With Subacromial Impingement Syndrome

Background and Aims The tendon of the biceps long head is one of the most important causes of shoulder pain and often plays a multifactorial role in subacromial impingement syndrome. The present study aimed to determine the effect of kinesiotape application on the tendon thickness of the biceps long head, pain, and proprioception of shoulder joint in athletes with subacromial impingement syndrome. Methods In this quasi-experimental study, 20 male athletes with subacromial impingement syndrome were selected purposefully and conveniently. The subjects were randomly assigned to two groups: group 1 received a real kinesiotape, and group 2 received a sham kinesiotape. Tendon thickness of the biceps long head was measured by MRI, shoulder proprioception was measured by an imaging technique, and the pain was measured by visual analog scale (VAS) immediately and 24 hours after using kinesiotape. The Shapiro-Wilk test was used to determine the normality of the distribution, and repeated measures analysis of variance was used to compare the mean differences between the two groups. The significance level was set at P&lt;0.05. Results There were no significant differences in the thickness of the biceps tendon between the two groups in the three stages of measurement (P=0.147). There was a significant difference between the two groups regarding the joint position sense at 45 degrees (P&lt;0.001), but there was no significant difference at 90 degrees (P˃0.05). There was a significant difference between the pain scores of the two groups after the kinesiology tape application (P&lt;0.001). Conclusion Kinesiotape can reduce pain and improve the proprioception sense in athletes with subacromial impingement syndrome.

How does a motor or cognitive dual-task affect our sense of upper limb proprioception?

Daily upper limb activities require multitasking and our division of attention. How we allocate our attention can be studied using dual-task interference (DTi). Given the vital role proprioception plays in movement planning and motor control, it is important to investigate how conscious upper limb proprioception is impacted by DTi through cognitive and motor interference. To examine how dual-task interference impacts conscious upper limb proprioception during active joint repositioning tasks (AJRT). Forty-two healthy participants, aged between 18 and 35, took part in this cross-sectional study. Participants completed two AJRT during three conditions: baseline (single task), dual-cognitive task (serial subtractions), and dual-motor task (non-dominant hand movements). The proprioceptive error (PE; difference between their estimation and targeted position) was measured using an AJRT of 75% and 90% of maximum internal rotation using the Biodex System IIITM and the Upper Limb Proprioception Reaching Test (PRO-Reach). To determine if PEs differed during dual-task interference, interference change scores from baseline were used with one sample t-tests and analyses of variance. The overall mean PE with the Biodex was 4.1° ± 1.9 at baseline. Mean change scores from baseline reflect a mean improvement of 1.5° ± 1.0 (p < .001) during dual-cognitive task and of 1.5° ± 1.2 (p < .001) during dual-motor task. The overall mean PE with the PRO-Reach was 4.4cm ± 1.1 at baseline. Mean change scores from baseline reflect a mean worsening of 1.0cm ± 1.1 (p < .001) during dual-cognitive task and improvement of 0.8cm ± 0.6 (p < .001) during dual-motor task. Analysis of variance with the Biodex PEs revealed an interference effect (p < .001), with the cognitive condition causing greater PEs compared to the motor condition and a criterion position effect (p = .006), where 75% of maximum IR produced larger PEs during both interference conditions. An interference effect (p = .022) with the PRO-Reach PEs was found highlighting a difference between the cognitive and motor conditions, with decreased PEs during the contralateral motor task. Interference tasks did impact proprioception. Cognitive interference produced mixed results, whereas improved proprioception was seen during motor interference. Individual task prioritization strategies are possible, where each person may choose their own attention strategy when faced with dual-task interference.

Sensory function and somatosensorial system changes according to visual acuity and throwing techniques in goalball players: A cross-sectional study.

The somatosensory system is a complect sensory system that differentiates individual athletes. The aim of this study is to investigate the effect of visual acuity level on throwing technique, proprioceptive sense of the shoulder joint, light touch and two-point discrimination sense of the upper extremity, and sensory function (postural control and reaction time) in visually impaired goalball players. Goalball players who have different visual acuities B1(unable to perceive light or recognize its shape); B2 (has a visual field of less than 5 degrees and can recognize shapes); B3 (visual field greater than 5 degrees and less than 20 degrees) participated in the study. The sensorial system was evaluated with proprioceptive sense of the shoulder joint and sensory tests (light touch and two-point discrimination sense of the dominant hand.). Sensory function (postural control and reaction time) was evaluated with the flamingo balance test, functional reach test, and pro-agility test. The goalball players' throwing technique was questioned. Seventeen male players, those aged 20-30 (20.8±3.9 years) who have been professionally engaged in goalball for at least three years (58.7-37.8 months) participated. Shoulder internal rotation joint position sense and the flamingo balance test were found to be different in the group with B1 visual acuity than in the group with B3 visual acuity (p = 0.042* and 0.028 respectively). There was no difference between groups with B1-B2 visual acuity (p = 0.394 and p = 0.065) and between groups with B2-B3 visual acuity (p = 0.792 and p = 0.931). There was no difference in the groups in terms of sensory tests and reaction time (p> 0.05). In goalball, joint position sense is related to throwing techniques. Although there is a general acceptance that other sensory systems should work harder to compensate for the sense of vision, fear of falling, athlete's branch year, sports year, muscle strength, and general physical condition of the athlete may affect the measurements made, especially in the dynamic position.

Generating Frequency Selective Vibrations in Remote Moving Magnets

Extensive efforts in providing upper limb amputees with sensory feedback have primarily focused on the restoration of tactile capabilities, while challenges in evoking proprioceptive sensations have been poorly addressed. Previously, an human–machine interface (HMI) was proposed based on permanent magnets implanted in residual muscles of an amputee, namely the myokinetic interface, to control robotic limb prostheses. Besides control, implanted magnets offer an unprecedent opportunity to trigger musculotendon proprioceptors via untethered selective vibrations. Herein, the challenge of tracking multiple moving magnets is addressed (e.g., following muscle contractions) while being vibrated by controlled magnetic fields produced by external coils. Results demonstrate the viability of a real‐time (RT) system capable of simultaneously tracking and vibrating multiple moving magnets within a three‐dimensional workspace. Highly selective torsional vibrations in the frequency span eliciting movement illusions (70, 80, and 90 Hz) are achieved on two moving magnets, with efficiencies above 0.82 (over 80% of spectral power at the desired frequency). Tracking accuracy and precision remain robust to the coil magnetic field, with position median errors below 1.2 mm and median displacement errors below 0.95 mm. This study represents a crucial step towards the development of a bench system to study proprioception in humans.

Effects of Balance and Strength Training for Ankle Proprioception in People with Chronic Ankle Instability: A Randomized Controlled Study.

After an ankle sprain, the ligament and joint capsule are damaged, and as a result, proprioceptive sense is damaged, causing a feeling of giving away in the ankle and resulting in recurrent sprains. Given the relevant studies, it has been seen that people with chronic ankle instability (CAI) commonly have deficits in joint position sense and reinjury risks. Joint position sense plays an important role in ankle control, thereby reducing the risk of injury. Therefore, this study aims to compare the effects of balance and strength training on ankle proprioception in people with CAI. This single-blind randomized controlled study included 29 volunteer participants (21 women and eight men) aged 18 to 30 years. Participants with a Cumberland ankle instability scale score less than or equal to 24 were randomly divided into two treatment groups: strength training (n = 14) and balance training (n = 15). Y balance test, joint position, and vibration sense were evaluated at the beginning and end of the treatment. "Hop to stabilization" exercises were applied to the balance group and resistive bands exercises to the strength group, which were performed for 6 weeks, 35 minutes per day, two times per week. There was no significant difference between the two groups in the anterior, posterolateral, and posteromedial directions of the Y balance test (P = .89, P = .50, and P = .34, respectively), but the strength training group showed significant improvement in ankle proprioception (140°) and vibration sense (fifth finger) (P < .001), and the post hoc Cohen's d effect size values were medium (.52) and small (.25), respectively. The findings of this study show that strengthening and balance exercises have similar effects on dynamic balance, but strengthening exercises are more effective in improving joint position and vibration sense. Given the positive effects of both exercise programs, it is recommended to implement the two interventions separately or together for CAI rehabilitation.

A pilot study: effect of somatosensory loss on motor corrections in response to unknown loads in a reaching task by chronic stroke survivors.

Despite recent studies indicating a significant correlation between somatosensory deficits and rehabilitation outcomes, how prevailing somatosensory deficits affect stroke survivors' ability to correct their movements and recover overall remains unclear. To explore how major deficits in somatosensory systems impede stroke survivors' motor correction to various external loads, we conducted a study with 13 chronic stroke survivors who had hemiparesis. An inertial, elastic, or viscous load, which was designed to impose perturbing forces with various force profiles, was introduced unexpectedly during the reaching task using a programmable haptic robot. Participants' proprioception and cutaneous sensation were also assessed using passive movement detection, finger-to-nose, mirror, repositioning, and Weinstein pressure tests. These measures were then analyzed to determine whether the somatosensory measures significantly correlated with the estimated reaching performance parameters, such as initial directional error, positional deviation, velocity deviations, and speed of motor correction were measured.Of 13 participants, 5 had impaired proprioception, as they could not recognize the passive movement of their elbow joint, and they kept showing larger initial directional errors even after the familiarization block. Such continuously found inaccurate initial movement direction might be correlated with the inability to develop the spatial body map especially for calculating the initial joint torques when starting the reaching movement. Regardless of whether proprioception was impaired or not, all participants could show the stabilized, constant reaching movement trajectories. This highlights the role of proprioception especially in the execution of a planned movement at the early stage of reaching movement.

Visual influence on bimanual haptic slant adaptation.

Adapting to particular features of a haptic shape, for example, the slant of a surface, affects how a subsequently touched shape is perceived (aftereffect). Previous studies showed that this adaptation is largely based on our proprioceptive sense of hand posture, yet the influence of vision on haptic shape adaptation has been relatively unexplored. Here, using a slant-adaptation paradigm, we investigated whether visual information affects haptic adaptation and, if so, how. To this end, we varied the available visual cues during the adaptation period. This process ranged from providing visual information only about the slant of the surface, or the reference frame in which it is presented, to only providing visual information about the location of the fingertips. Additionally, we tested several combinations of these visual cues. We show that, as soon as the visual information can be used as a spatial reference to link the own fingertip position to the surface slant, haptic adaptation is very much reduced. This result means that, under these viewing conditions, vision dominates touch and is one reason why we do not easily adapt to haptic shape in our daily life, because we usually have visual information about both hand and object available simultaneously.