[BIC-announce] Seminar in Biomedical Engineering - Wednesday Feb 12th - 1h pm - Room 333

[Christophe Grova]

Dear all, 

We will have our next  Biomedical Engineering seminar tomorrow

Wednesday  ­ Feb 12th,  at 1 pm

Location: Room  333 Lyman Duff Building (Biomedical Engineering Dpt, 3775
University Street).

Speaker:  Dr  T. Vanos, PhD, postdoctoral fellow under the supervision of
Dr. C. Pack, Montreal Neurological Institute, McGill University, Montreal,
Canada

Title: 
"Traveling waves in the macaque visual cortex optimize postsaccadic visual
processing"


Abstract:
Traveling waves of neural activity are frequently evoked by the presentation
of a sensory stimulus or the execution of a movement. Although such waves
have been observed for decades, little is known about their function. Here
we show that traveling waves in the extrastriate visual cortex provide a
means of integrating sensory and motor signals. Specifically, we describe a
traveling wave of local field potential (LFP) activity in cortical area V4
of macaque monkeys that is triggered by the execution of saccadic eye
movements. The amplitudes of these waves encode the direction and size of
each saccade, while their direction follows the V4 retinotopic map from
fovea to periphery. As they propagate, the waves modulate the excitability
of individual neurons, suggesting that they could provide a mechanism of
prioritizing visual processing of stimuli that have been selected as the
targets of saccades. Using single-neuron data, we also analyzed the strength
and spatial organization of the functional connectivity within the V4
network. This analysis involved a previously published method, based on the
nonlinear Volterra modeling approach. The results revealed that each saccade
was associated with specific changes in single-neuron functional
connectivity, which typically reorganized along a path parallel to the
motion of the LFP wave. Taken together these results demonstrate that each
saccade instantiates a dynamic reallocation of visual processing within area
V4, modulated by the traveling wave.


A list of upcoming seminars can be found at :
http://www.mcgill.ca/bme/news/seminars

See you there 

 
Christophe Grova 

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Christophe Grova, PhD
Assistant Professor
Biomedical Engineering Dpt
Neurology and Neurosurgery Dpt
 
Multimodal Functional Imaging Lab (Multi FunkIm)
Montreal Neurological Institute
Centre de Recherches en Mathématiques
 
Biomedical Engineering Department - Room 304
McGill University
3775 University Street, Montreal, Quebec, Canada,
H3A 2B4 
email : christophe.grova at mcgill.ca <mailto:christophe.grova at mcgill.ca>
tel : (514) 398 2516
fax : (514) 398 7461
 
Web:
http://www.bic.mni.mcgill.ca/ResearchLabsMFIL/PeopleChristophe
http://www.bmed.mcgill.ca/
MultiFunkIm Lab:
http://www.bic.mni.mcgill.ca/ResearchLabsMFIL/HomePage
 
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