文章基本信息

标题：Bimanual Grasping Adheres to Weber's Law
本地全文：下载
作者：Constanze Hesse ; Róisín Elaine Harrison ; Martin Giesel 等
期刊名称：i-Perception
电子版ISSN：2041-6695
出版年度：2021
卷号：12
期号：6
页码：1-16
DOI：10.1177/20416695211054534
语种：English
出版社：Pion Ltd.
摘要：Weber's law states that our ability to detect changes in stimulus attributes decreases linearly with their magnitude. This principle holds true for many attributes across sensory modalities but appears to be violated in grasping. One explanation for the failure to observe Weber's law in grasping is that its effect is masked by biomechanical constraints of the hand. We tested this hypothesis using a bimanual task that eliminates biomechanical constraints. Participants either grasped differently sized boxes that were comfortably within their arm span (action task) or estimated their width (perceptual task). Within each task, there were two conditions: One where the hands’ start positions remained fixed for all object sizes (meaning the distance between the initial and final hand-positions varied with object size), and one in which the hands’ start positions adapted with object size (such that the distance between the initial and final hand-position remained constant). We observed adherence to Weber's law in bimanual estimation and grasping across both conditions. Our results conflict with a previous study that reported the absence of Weber's law in bimanual grasping. We discuss potential explanations for these divergent findings and encourage further research on whether Weber's law persists when biomechanical constraints are reduced.
关键词：enperception–action dissociation;psychophysics;two-visual streams