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Dumoulin will discuss biologically-inspired data-analysis methods and ultra-high field MRI at 7T for visual neurosciences, in particular for estimating the neuronal population receptive field (pRF) properties in human cortex.

Detail Summary
Date 10 October 2016
Time 16:00 - 18:00

Abstract

I will discuss biologically-inspired data-analysis methods and ultra-high field MRI at 7T for visual neurosciences, in particular for estimating the neuronal population receptive field (pRF) properties in human cortex. In visual cortex, we show that these pRF sizes and their suppressive surrounds vary in a systematic way between and within different visual field maps and across cortical layers.

Next, I will describe how spatial attention draws pRFs across the visual field towards its focus at multiple levels of the visual hierarchy. An additional “attention field” captures these pRF shifts, such that visuo-spatial responses depend on both stimulus-driven feedforward activity and attention-driven feedback modulation. A similar size of the attention field across multiple visual areas suggests a constant attention influence at different stages of the visual hierarchy.

In essence, spatial attention transforms the visual field representation analogous to a magnifying glass or zoom lens. Last, I will discuss novel analyses to capture numerosity tuning in humans. We describe neural populations tuned to numerosities that are organized topographically in parietal cortex. This suggests that topography may be a general organization principle of human cortex.

Serge O. Dumoulin, Ph.D.
Director, Spinoza Centre for Neuroimaging, Amsterdam
Professor, Experimental Psychology, Utrecht University
www.spinozacentre.nl & www.sergedumoulin.net

 

Oudemanhuispoort
Oudemanhuispoort

Oudemanhuispoort 4-6
1012 CN Amsterdam