Adaptation of pointing and visual localization in depth around the natural grasping distance

Abstract

Vision in depth is distorted. A similar distortion can be observed for pointing to visual targets in depth. It has been suggested that pointing errors in depth reflect the visual distortion. Alternatively, pointing in depth might be guided by a prior that biases movements toward the natural grasping distance at which object manipulation is usually performed. To dissociate whether pointing is guided by distorted vision only or whether it takes into account a natural grasping distance prior, we adapted pointing movements. Participants received visual feedback about the success of their pointing once the movement was finished. We distorted the feedback to signal either that pointing was not far enough or in separate sessions that pointing was too far. Participants adapted to this artificial error by either extending or shortening their pointing movements. The generalization of pointing adaptation revealed a bias in movement planning that is inconsistent with pointing being guided only by distorted vision but with the involvement of knowledge about the natural grasping distance. Adaptation was strongest for pointing movements to a middle position that corresponds to the natural grassing distance and it was weakest for movements leading away from it. It has been demonstrated that pointing adaptation in depth changes visual perception (Volcic et al., 2013). We also wondered how effects of pointing adaptation on visual space would generalize in depth. We found that adaptation changed visual space, but that this change was independent of the adaptation direction.

Visual Uncertainty Unveils the Distinct Role of Haptic Cues in Multisensory Grasping

“…Moreover, studies on cataract-treated participants showed the restoration of visual object recognition ( Held et al, 2011 ; Chen et al, 2016 ) and the acquisition of multisensory integration ( Senna et al, 2021 ) is possible within a brief period after surgery by exploiting the cross-modal interactions between vision and touch. The haptic and visual recalibration is also visible in adults following visuomotor adaptation tasks ( Volcic et al, 2013 ; Wiesing et al, 2021 ), which might be related to the strong couplings that exist between the senses and movement control ( Steinbach and Held, 1968 ; Bock, 1987 ; Maiello et al, 2018 ). Our results complement these findings and raise the intriguing possibility that the haptic modality available during sensorimotor interactions with the environment could be effective in learning or restoring visuomotor functions during development and throughout the lifespan.…”

Functional Specificity of the Affordance of Reaching

“…Participants were more accurate pointing at targets that appeared further away from their body than the targets that appeared close to them to determine reachability. One possible reason for this could be the observed utility for pointing movements toward the natural grasping distance (i.e., pointing gestures that require the participant to extend their arm to maximum arm length) as opposed to movements away from the natural grasping distance (Wiesing et al., 2021). This would mean that pointing judgments would be more accurate for targets that appeared at or beyond reach and biased within reach.…”

Computer Vision Positioning and Local Obstacle Avoidance Optimization Based on Neural Network Algorithm

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