Document Detail

Different motion cues are used to estimate time-to-arrival for frontoparallel and looming trajectories.
MedLine Citation:
PMID:  22056519     Owner:  NLM     Status:  MEDLINE    
Estimation of time-to-arrival for moving objects is critical to obstacle interception and avoidance, as well as to timing actions such as reaching and grasping moving objects. The source of motion information that conveys arrival time varies with the trajectory of the object raising the question of whether multiple context-dependent mechanisms are involved in this computation. To address this question we conducted a series of psychophysical studies to measure observers' performance on time-to-arrival estimation when object trajectory was specified by angular motion ("gap closure" trajectories in the frontoparallel plane), looming (colliding trajectories, TTC) or both (passage courses, TTP). We measured performance of time-to-arrival judgments in the presence of irrelevant motion, in which a perpendicular motion vector was added to the object trajectory. Data were compared to models of expected performance based on the use of different components of optical information. Our results demonstrate that for gap closure, performance depended only on the angular motion, whereas for TTC and TTP, both angular and looming motion affected performance. This dissociation of inputs suggests that gap closures are mediated by a separate mechanism than that used for the detection of time-to-collision and time-to-passage. We show that existing models of TTC and TTP estimation make systematic errors in predicting subject performance, and suggest that a model which weights motion cues by their relative time-to-arrival provides a better account of performance.
Finnegan J Calabro; Scott A Beardsley; Lucia M Vaina
Related Documents :
7379879 - Failure to find luxotonic responses for single units in visual cortex of the rabbit.
18768639 - Sensory regulation of network components underlying ciliary locomotion in hermissenda.
23487569 - Daily rhythms of period protein in the eyestalk of the american lobster, homarus americ...
23425359 - Peripheral circadian clocks-a conserved phenotype?
14504939 - Effect of light on stochastic phase synchronization in the crayfish caudal photoreceptor.
986629 - A window amplitude discriminator with adjustable upper and lower thresholds.
7652039 - Night-shift work in antarctica: sleep characteristics and bright light treatment.
12854649 - The fluttering-heart illusion: a new hypothesis.
23088189 - Effects of preheating and precooling on the hardness and shrinkage of a composite resin...
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2011-10-26
Journal Detail:
Title:  Vision research     Volume:  51     ISSN:  1878-5646     ISO Abbreviation:  Vision Res.     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-11-28     Completed Date:  2012-01-25     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  2378-85     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Department of Biomedical Engineering, Boston University, 44 Cummington St., Boston, MA 02215, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Distance Perception
Motion Perception / physiology*
Photic Stimulation / methods
Task Performance and Analysis
Time Perception / physiology*
Young Adult
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  The fictile coordination chemistry of cuprous-thiolate sites in copper chaperones.
Next Document:  Meiotic silencing by unpaired DNA is expressed more strongly in the early than the late perithecia o...