Both vision-for-perception and vision-for-action follow Weber's law at small object sizes, but violate it at larger sizes

被引:26
作者
Bruno, Nicola [1 ]
Uccelli, Stefano [1 ]
Viviani, Eva [1 ]
de'Sperati, Claudio [2 ,3 ]
机构
[1] Univ Parma, I-43100 Parma, Italy
[2] Univ Vita Salute San Raffaele, Milan, Italy
[3] IRCCS San Raffaele Sci Inst, Expt Psychol Unit, Div Neurosci, Milan, Italy
关键词
Action; Perception; Weber's law; Precision grip; Manual estimation; Accuracy; Precision; MECHANISMS; PREHENSION; ILLUSION;
D O I
10.1016/j.neuropsychologia.2016.08.022
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
According to a previous report, the visual coding of size does not obey Weber's law when aimed at guiding a grasp (Ganel et al., 2008a). This result has been interpreted as evidence for a fundamental difference between sensory processing in vision-for-perception, which needs to compress a wide range of physical objects to a restricted range of percepts, and vision-for-action when applied to the much narrower range of graspable and reachable objects. We compared finger aperture in a motor task (precision grip) and perceptual task (cross modal matching or "manual estimation" of the object's size). Crucially, we tested the whole range of graspable objects. We report that both grips and estimations clearly violate Weber's law with medium-to-large objects, but are essentially consistent with Weber's law with smaller objects. These results differ from previous characterizations of perception-action dissociations in the precision of representations of object size. Implications for current functional interpretations of the dorsal and ventral processing streams in the human visual system are discussed. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:327 / 334
页数:8
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