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Functional specialization and generalization for grouping of stimuli based on colour and motion

Semir Zeki, Jonathan Stutters
2013 NeuroImage  
stimuli according to attribute, and specifically according to colour and motion.  ...  colour (V4) or motion (V5); (b) that the functional separation evident in visual cortical areas devoted to motion and colour, respectively, is maintained at the level of parietal cortex, at least as far  ...  We thank Stewart Shipp, Tomohiro Ishizu and John Romaya who read, and commented on, earlier versions of the manuscript.  ... 
doi:10.1016/j.neuroimage.2013.02.001 pmid:23415950 pmcid:PMC3613798 fatcat:h2bwnsido5hxhf4wsqkcdoemsi

Isoluminance and chromatic motion perception throughout the visual field

Lynda Bilodeau, Jocelyn Faubert
1997 Vision Research  
We propose that the lower visual field and not the superior visual field is specialized for colour motion information. © 1997 Elsevier Science Ltd.  ...  Our manipulations did not entirely compensate for a given eccentricity, which implies the need for a post-receptoral scaling function for the perception of drifting chromatic stimuli.  ...  and Andrew Metha and an anonymous reviewer for constructive comments on the earlier draft.  ... 
doi:10.1016/s0042-6989(97)00012-6 pmid:9327055 fatcat:hm5zyfhn4vgenparkfam2xod6a

A brain-derived metric for preferred kinetic stimuli

S. Zeki, J. Stutters
2012 Open Biology  
We are indebted to Dominic ffytche, Stewart Shipp and members of the Wellcome Laboratory of Neurobiology for their critical reading of this manuscript.  ...  Basing ourselves on the functional specialization of the visual brain for different visual attributes [2] [3] [4] , among which is a specialization for visual motion [5] [6] [7] , we asked whether there  ...  The functional specialization of the visual brain [2] [3] [4] allowed us to restrict our enquiry to one domain, that of visual motion.  ... 
doi:10.1098/rsob.120001 pmid:22645660 pmcid:PMC3352092 fatcat:bfgikypjezgglavflz5kqwlyqa

Page 369 of Psychological Abstracts Vol. 90, Issue 2 [page]

2003 Psychological Abstracts  
(U Padua, Dept of General Psychology, Padua, Italy) Absolute and relative effects of similarity and dis- tance on grouping. Perception, 2002, Vol 31(7), 799-811.  ...  These results suggest that there are two different motion pathways: one that specializes in relative motion and one that specializes in uniform or global motion.  ... 

The Integration of Colour and Motion by the Human Visual Brain

Matthew W. Self, S. Zeki
2004 Cerebral Cortex  
We show, using functional magnetic resonance imaging (fMRI), that both colour and motion defined shapes activate the lateral occipital complex (LOC) and that shapes defined by both colour and motion simultaneously  ...  Objects in the visual scene are defined by different cues such as colour and motion.  ...  Notes We would like to thank John Romaya for his technical assistance and Drs. Andreas Bartels and Stewart Shipp for their helpful comments on this manuscript.  ... 
doi:10.1093/cercor/bhi010 pmid:15616131 fatcat:qau7bb5mwbc7xp4iw5tbbu5y7y

The Ferrier Lecture 1995 Behind the Seen: The functional specialization of the brain in space and time

S. Zeki
2005 Philosophical Transactions of the Royal Society of London. Biological Sciences  
In summary, a specialization for colour is now generally acknowledged, just as a specialization for motion is accepted.  ...  Whatever the reasons, the argument against a specialization for colour and for motion, and hence against a functional specialization in the visual brain, suffered a serious blow with the advent of brain  ... 
doi:10.1098/rstb.2005.1666 pmid:16147515 pmcid:PMC1609195 fatcat:la6heoyp55bdbkm2ong4f576em

Methods for Dichoptic Stimulus Presentation in Functional Magnetic Resonance Imaging - A Review

Bhaskar Choubey, Alina Jurcoane, Lars Muckli, Ruxandra Sireteanu
2009 The Open Neuroimaging Journal  
Dichoptic stimuli (different stimuli displayed to each eye) are increasingly being used in functional brain imaging experiments using visual stimulation.  ...  In this paper, we review various approaches of displaying dichoptic stimulus used in functional magnetic resonance imaging experiments.  ...  The software from the authors for goggles is free and open-source; however, it comes with no warranty or support.  ... 
doi:10.2174/1874440000903010017 pmid:19526076 pmcid:PMC2695625 fatcat:ng2pdwpaxzcq7eb7kly5hmemdu

Multiple asynchronous stimulus- and task-dependent hierarchies (STDH) within the visual brain's parallel processing systems

Semir Zeki, John Foxe
2016 European Journal of Neuroscience  
The latter shows that we see (and become aware of) different visual attributes at different times, with colour leading form (orientation) and visual motion, even though it is signals from fast moving stimuli  ...  These anatomical hierarchies do not conform to the temporal order with which visual signals reach and activate V1 and the specialized visual areas.  ...  I thank Stewart Shipp and Dominic ffytche for their helpful comments and suggestions on earlier versions of this manuscript. Conflict of Interest None to declare. References  ... 
doi:10.1111/ejn.13270 pmid:27153180 fatcat:sschw2mlarfkboysrgwx47dlsq

The contribution of human cortical area V3A to the perception of chromatic motion: a transcranial magnetic stimulation study

D. J. McKeefry, M. P. Burton, A. B. Morland
2010 European Journal of Neuroscience  
Area V3A was identified in five human subjects on both a functional and retinotopic basis using functional magnetic resonance imaging techniques.  ...  The stimuli used for this task included chromatic, isoluminant motion stimuli that activated either the L)M or S)(L+M) cone-opponent mechanisms, in addition to moving stimuli that contained only luminance  ...  We thank the staff of the York Neuroimaging Centre for their assistance in the scanning sections of these experiments.  ... 
doi:10.1111/j.1460-9568.2010.07095.x pmid:20105228 fatcat:ug5pwerz2zeptmxtmgpqyydm3e

Two mechanisms underlying the effect of angle of motion direction change on colour–motion asynchrony

Kaoru Amano, Alan Johnston, Shin'ya Nishida
2007 Vision Research  
First, the reported dependence on the motion direction angle was particularly strong for random-dot stimuli, but our results indicate that this may reflect the introduction of an artefact, motion streaks  ...  Second, when we used streak-free plaid stimuli, a certain amount of angle dependence remained regardless of whether we asked the observers to judge the apparent binding or synchrony of colour and motion  ...  Acknowledgments We thank Derek Arnold for his helpful comments. K.A. was supported by the Japan Society for the Promotion of Science.  ... 
doi:10.1016/j.visres.2006.11.018 pmid:17254624 fatcat:l6l27tvcgzhjfjoar5yx6eje2a

Exposure to Organic Solvents Used in Dry Cleaning Reduces Low and High Level Visual Function

Ingrid Astrid Jiménez Barbosa, Mei Ying Boon, Sieu K. Khuu, Benjamin Thompson
2015 PLoS ONE  
features such as luminance contrast and colour, higher level processing of global motion and form (Experiment 1), and cognitive function as measured in a visual search task (Experiment 2).  ...  of colour) and high level visual deficits such as the perception of global form and motion, but not visual search performance.  ...  Behavioural Assessments Stimuli were generated on an Apple Macintosh Mac Book Pro computer.  ... 
doi:10.1371/journal.pone.0121422 pmid:25933026 pmcid:PMC4416825 fatcat:bspmgni5dne6dnelxzcyj3pogm

Page 660 of Psychological Abstracts Vol. 91, Issue 2 [page]

2004 Psychological Abstracts  
Al- though colour singletons failed to capture attention, a motion signal, based solely on chromatic information, was able to direct attention in the patient.  ...  There have been advances in the prevention of vascular dementia, and based on evidence from epide- miological studies, the possibility of preventive measures for AD is on the horizon. 5088.  ... 

Motion processing in pigeon tectum: equiluminant chromatic mechanisms

H.-J. Sun, B. J. Frost
1997 Experimental Brain Research  
A moving coloured object was presented on a uniform (opponent coloured) background (e.g. blue-on-yellow, red-on-green and black-on-white).  ...  These results suggest that tectal units can detect motion of a pattern defined by a pure colour contour, although the strength of output is considerably weaker than that for the movement of patterns formed  ...  groups (for different colours).  ... 
doi:10.1007/pl00005771 pmid:9372292 fatcat:yptxlehkjjfcndaqq7rp7ff774

Stream/Bounce Event Perception Reveals a Temporal Limit of Motion Correspondence Based on Surface Feature over Space and Time

Yousuke Kawachi, Takahiro Kawabe, Jiro Gyoba
2011 i-Perception  
Moreover, controls (Experiments 4a-4c) showed that cognitive bias based on feature (colour/luminance) congruency across the occlusion could not fully account for the effects of surface features on the  ...  We examined how stream/bounce event perception is affected by motion correspondence based on the surface features of moving objects passing behind an occlusion.  ...  In our stimuli the motion reversal was characterized by the colour/luminance switch. Hence, it is possible that attentive tracking is responsible for motion correspondence based on surface feature.  ... 
doi:10.1068/i0399 pmid:23145236 pmcid:PMC3485788 fatcat:n6hujiudfna6tmvw5seqj5blre

Looking all around: honeybees use different cues in different eye regions

1998 Journal of Experimental Biology  
Based on results of early as well as recent behavioural studies, the present review compares the performance of different eye regions in exploiting information on shape, colour and motion, relevant to  ...  It is concluded that the functional differences found among different eye regions are based on neural mechanisms subserving the bee's natural needs, rather than on peripheral specializations.  ...  hypothesis' based on the use of image motion.  ... 
pmid:9817826 fatcat:q4bndoi7prbjvgyswgrtvuye7e
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