Actions obey Weber's law when precision is evaluated at goal attainment
Camponogara, I.; Volcic, R.
Show abstract
Webers law, the psychophysical principle stating that the just noticeable difference (JND), which is inversely related to sensory precision, increases proportionally with the magnitude of a stimulus, impacts all domains of human perception, but it is violated in visually guided grasping actions. The underlying reasons for this dissociation between perception and action are still debated, and various hypotheses have been put forward, including a different coding of visual size information for perception and action, the use of positional information to guide grasping, biomechanical factors, or sensorimotor calibration. To contrast these hypotheses, we investigated Webers law in a new action task, the two-finger pointing task. Participants reached and touched two targets positioned at different distances apart by using their index finger and thumb. Consistent with Webers law, we found that the standard deviation (SD) of the final inter-finger separation, serving as a measure analogous to the JND, increased with larger inter-target distances. These findings suggest that, when considering measures strongly related with the attainment of the action goal, Webers law is regularly at play.
Matching journals
The top 6 journals account for 50% of the predicted probability mass.
Similar papers in this journal
- Are reaching and grasping effector-independent? Similarities and differences in reaching and grasping kinematics between the hand and foot 97%
- Object motion influences feedforward motor responses during mechanical stopping of virtual projectiles: A preliminary study 97%
- From static to dynamic: how object rotation influences grasp decisions in ambiguous settings 96%
Similar papers in this journal
- Information processing in the Hand Laterality Judgement Task: Fundamental differences between dorsal and palmar views revealed by a Forced Response paradigm 97%
- Illusory tactile movement crosses arms and legs and is coded in external space 96%
- Theory of Visual Attention (TVA) in Action: Assessing Premotor Attention in Simultaneous Eye-Hand Movements 96%
Similar papers in this journal
"Similar papers" are the closest papers from that journal in the model's embedding space. They show what the match is built on, but the ranking comes mostly from a classifier over the whole training set, not from these examples alone.