Document Detail

Visual perception and interception of falling objects: a review of evidence for an internal model of gravity.
MedLine Citation:
PMID:  16135884     Owner:  NLM     Status:  MEDLINE    
Prevailing views on how we time the interception of a moving object assume that the visual inputs are informationally sufficient to estimate the time-to-contact from the object's kinematics. However, there are limitations in the visual system that raise questions about the general validity of these theories. Most notably, vision is poorly sensitive to arbitrary accelerations. How then does the brain deal with the motion of objects accelerated by Earth's gravity? Here we review evidence in favor of the view that the brain makes the best estimate about target motion based on visually measured kinematics and an a priori guess about the causes of motion. According to this theory, a predictive model is used to extrapolate time-to-contact from the expected kinetics in the Earth's gravitational field.
Myrka Zago; Francesco Lacquaniti
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Publication Detail:
Type:  Journal Article; Review     Date:  2005-08-31
Journal Detail:
Title:  Journal of neural engineering     Volume:  2     ISSN:  1741-2560     ISO Abbreviation:  J Neural Eng     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-01     Completed Date:  2006-01-03     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  101217933     Medline TA:  J Neural Eng     Country:  England    
Other Details:
Languages:  eng     Pagination:  S198-208     Citation Subset:  IM    
Department of Neuromotor Physiology, IRCCS Santa Lucia Foundation, Via Ardeatina 306, 00179 Rome, Italy.
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MeSH Terms
Adaptation, Physiological / physiology
Arm / physiology*
Brain / physiology*
Clinical Trials as Topic
Evidence-Based Medicine
Models, Neurological*
Motion Perception / physiology*
Motor Skills / physiology*
Movement / physiology*
Proprioception / physiology*
Reflex, Vestibulo-Ocular / physiology

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