Relative size of numerical magnitude induces a size-contrast effect on the grip scaling of reach-to-grasp movements

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Title:	Relative size of numerical magnitude induces a size-contrast effect on the grip scaling of reach-to-grasp movements
Authors:	吳嫻;Chiou, Rocco Y.-C.;Wu, Denise H.;Tzeng, Ovid J.-L.;Hung, Daisy L.;Chang, Erik C.
Contributors:	生醫理工學院認知神經科學研究所
Keywords:	A theory of magnitude (ATOM);Automatic comparison;Brain - physiology;Grip aperture;Hand - physiology;Hand Strength - physiology;Humans;Movement - physiology;Numerical cognition;Psychomotor Performance - physiology;Reach-to-grasp action;Size Perception - physiology;Young Adult
Date:	2012-01-01
Issue Date:	2026-04-23 14:35:43 (UTC+8)
Publisher:	Masson SpA;Italy: Elsevier Ltd
Abstract:	摘要： Previous research found that quantitative information labelled on target objects of grasping movement modulates grip apertures. While the interaction between numerical cognition and sensorimotor control may reflect a general representation of magnitude underpinned by the parietal cortex, the nature of this embodied cognitive processing remains unclear. In the present study, we examined whether the numerical effects on grip aperture can be flexibly modulated by the relative magnitude between numbers under a context, which suggests a trial-by-trial comparison mechanism to underlie this effect. The participants performed visual open-loop grasping towards one of two adjacent objects that were of the same physical size but labelled with different Arabic digits. Analysis of participants’ grip apertures revealed a numerical size-contrast effect, in which the same numerical label (i.e., 5) led to larger grip apertures when it was accompanied by a smaller number (i.e., 2) than by a larger number (i.e., 8). The corrected grip aperture over the time course of movement showed that the numerical size-contrast effect remained significant throughout the grasping movement, despite a trend of gradual dissipation. Our findings demonstrated that interactions between number and action critically depend on the size-contrast of magnitude information in the context. Such a size-contrast effect might result from a general system, which is sensitive to relative magnitude, for different quantity domains. Alternatively, the magnitude representations of numbers and action might be processed separately and interact at a later stage of motor programming. 其他題名： Cortex 出版者： Italy: Elsevier Ltd 出版日期： 2012-09-01 出處： Cortex, 2012-09, Vol.48 (8), p.1043-1051 版權： 2011 Elsevier Srl 版權： Copyright © 2011 Elsevier Srl. All rights reserved. 識別號： ISSN: 0010-9452 識別號： ISSN: 1973-8102 識別號： EISSN: 1973-8102 識別號： DOI: 10.1016/j.cortex.2011.08.001 識別號： PMID: 21889134
Appears in Collections:	[College of Science Institute of Cognitive Neuroscience] journal & Dissertation

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