Significance Tactile sensations on a moving hand are perceived weaker than when presented the same but stationary hand. There is an ongoing debate about whether this perception based sensorimotor predictions or due to blanket reduction in sensitivity. Here, we show greater suppression of matching predicted sensory feedback. This reinforces idea precise estimations future body states suppressing Our results shine light mechanisms human control and relevant for understanding clinical phenomena...

To grasp an object one needs to determine suitable positions on its surface for placing the digits and move those positions. If is displaced during a reach-to-grasp movement, digit movements are quickly adjusted. Do these fast adjustments only guide previously chosen of object, or choice contact points also constantly reconsidered? Subjects grasped ball cube that sometimes rotated briefly when started moving. The followed rotation within 115 ms. When was ball, subjects counteracted initial...

Abstract Sensorimotor control of human action integrates feedforward policies that predict future body states with online sensory feedback. These predictions lead to a suppression the associated feedback signals. Here, we examine whether somatosensory processing throughout goal-directed movement is constantly suppressed or dynamically tuned so enhanced at critical moments movement. Participants reached towards their other hand in absence visual input and detected probing tactile stimulus on...

The perception of tactile stimuli presented on a moving hand is systematically suppressed. Such suppression has been attributed to the limited capacity brain process task-irrelevant sensory information. Here, we examined whether humans do not only suppress movement-irrelevant but also enhance in parallel movement-relevant signals when performing goal-directed reaching movement. Participants reached either visual (LED) or somatosensory target (thumb index finger their unseen static hand) and...

Tactile stimuli on moving limbs are typically attenuated during reach planning and execution. This phenomenon has been related to internal forward models that predict the sensory consequences of a movement. suppression is considered occur due match between actual predicted movement, which might free capacities process novel or task-relevant signals. Here, we examined whether how tactile depends relevance somatosensory information for reaching. Participants reached with their left right index...

Somatosensory perception is hampered on the moving limb during a goal-directed movement. This somatosensory suppression mostly attributed to forward model that predicts future states of system based established motor command. Here, we examined whether and how this modulated by predictability object features important for controlling grasping Participants reached grasp an between thumb index finger then lifted it as straight possible. Objects with symmetric or asymmetric mass distributions...

Abstract Vision is important for various tasks, from visually tracking moving objects to maintaining balance. People obtain visual information through eye movements performed either alone or in combination with head movements. Even when isolated can accommodate the amplitude of desired gaze shift, humans still perform movements, as they provide additional sensory signals that be integrated retinal input resulting improved estimates. However, also create mechanical torques and attenuate...

Tactile sensitivity is decreased on a moving limb compared to the same static limb. This tactile suppression likely reflects an interplay between sensorimotor predictions and sensory feedback. Here, we examined how visuomotor predictability influences suppression. Participants were instructed hit approaching virtual object, with object either never rotating, or always rotating unpredictably, prompting related movement adjustments. We probed by delivering vibrotactile stimulus of varying...

ABSTRACT To grasp an object the digits need to be placed at suitable positions on its surface. The selection of such grasping points depends several factors. Here authors examined whether being able see 1 selected is a factor. Subjects grasped large cylinders or oriented blocks that would normally with thumb continuously visible and final part index finger's trajectory occluded by in question. An opaque screen hid thumb's usual point was used examine individuals choose grip differently...

Somatosensory signals on a moving limb are typically suppressed. This results mainly from predictive mechanism that generates an efference copy, and attenuates the predicted sensory consequences of movement. Sensory feedback is, however, important for movement control. Behavioral studies show strength suppression increases during somatosensory reaching, when reach-relevant target can be additionally used to plan guide movement, leading increased reliability sensorimotor predictions. It is...

We examined whether the movement path is considered when selecting positions at which digits will contact object's surface (grasping points). Subjects grasped objects of different heights but with same radius various locations on a table. At some locations, one digit crossed to side object opposite where it started. In doing so, moved over short whereas curved around tall object. This resulted in very paths for objects. Importantly, selection grasping points was unaffected. That subjects do...

We use visual information to guide our grasping movements. When an object with a precision grip, the two digits need reach different positions more or less simultaneously, but eyes can only be directed one position at time. Several studies that have examined eye movements in found people tend direct their gaze near where index finger will contact object. Here we aimed better understanding why do so by asking participants lift off horizontal surface. They were grasp grip while of hand, and...

Tactile suppression refers to the phenomenon that tactile signals are attenuated during movement planning and execution when presented on a moving limb compared rest. It is usually explained in context of forward model control predicts sensory consequences an action. Recent research suggests aging increases reliance sensorimotor predictions resulting stronger somatosensory suppression. However, mechanisms contributing this age effect remain be clarified. We measured age-related differences...

Abstract The processing of somatosensory information is hampered on a moving limb. This suppression has been widely attributed to sensorimotor predictions that suppress the associated feedback, though postdictive mechanisms are also involved. Here, we investigated extent which limb influenced by backward signals, such as afferents with forces this applies. Participants grasped and lifted objects symmetric asymmetric mass distributions using precision grip. We probed at moment grasp...

People have often been reported to look near their index finger's contact point when grasping. They only the thumb's grasping an opaque object at eye height with a horizontal grip—thus region is occluded. To examine what extent being able see digits' final trajectories influences where people look, we compared gaze reaching grasp glass of water or milk that was placed hip height. Participants grasped and poured its contents into another on left. Surprisingly, most participants looked nearer...

How humans visually select where to grasp an object depends on many factors, including stability and preferred configuration. We examined how endpoints are selected when these two factors brought into conflict: Do people favor stable grasps or do they prefer their natural configurations? Participants reached one of three cuboids oriented so that its corners were either aligned with, rotated away from, each individual's axis (NGA). All objects made brass (mass: 420 g), but the surfaces sides...

It has been suggested that tactile signals are suppressed on a moving limb to free capacities for processing other relevant sensory signals. In line with this notion, we recently showed suppression is indeed stronger in the presence of reach-relevant somatosensory Here examined whether effect also generalizes additional visual during reaching. Brief vibrotactile stimuli were presented participants' right index finger either right-hand reaching previously illuminated target LED, or rest....

For any type of goal-directed hand and eye movement, it is important to determine the position target. Though many these movements are directed toward visual targets, humans also perform targets derived by somatosensory information only, such as proprioceptive (sensory signals about static limb position), kinesthetic movement), tactile touch on skin). In this study we investigated how each types influences movements. Furthermore, examined whether target has a differential influence isolated...

We examined whether challenging upright stance influences the execution of a grasping task. Participants reached to grasp small sphere while standing either on stable surface or foam. Before reaching for sphere, participants exhibited more body sway and greater fluctuations in centre pressure when While overall posture changed less foam than surface. The digits' wrist's movements towards were no different Presumably, redundancy way can be performed is exploited choose most suitable changes...