Reference : Attentional shifts induced by uninformative number symbols modulate neural activity i...
Scientific Presentations in Universities or Research Centers : Scientific presentation in universities or research centers
Social & behavioral sciences, psychology : Neurosciences & behavior
http://hdl.handle.net/10993/18978
Attentional shifts induced by uninformative number symbols modulate neural activity in human occipital cortex
English
Schiltz, Christine mailto [University of Luxembourg > Faculty of Language and Literature, Humanities, Arts and Education (FLSHASE) > Education, Culture, Cognition and Society (ECCS) >]
Goffaux, Valérie mailto []
Martin, Romain mailto [University of Luxembourg > Faculty of Language and Literature, Humanities, Arts and Education (FLSHASE) > Education, Culture, Cognition and Society (ECCS) >]
Dormal, Giulia []
Goebel, Rainer mailto []
17-Jul-2012
International
Workshop “Making Sense of Numbers”
17-07-2012
Oxford University
Oxford
United Kingdom
[en] Number processing interacts with space encoding in a wide variety of experimental paradigms. Most intriguingly, the passive viewing of uninformative number symbols can shift visuo-spatial attention to different target locations according to the number magnitude, i.e. small/large numbers facilitate processing of left/right targets, respectively. The brain architecture dedicated to these attention shifts associated with numbers currently remains unknown. Evoked potential recordings indicate that both early and late stages are involved in this spatio-numerical interaction, but the neuro-functional anatomy needs to be specified. Here we use, for the first time, functional magnetic resonance imaging (fMRI) to investigate attentional orienting following uninformative Arabic digits. We show that BOLD response in occipital visual regions was modulated by the congruency between digit magnitude (small/large) and target side (left/right). Additionally, we report higher BOLD responses following large (8, 9) compared to small (1, 2) digits in two bilateral parietal regions, yielding a significant effect of digit magnitude. We propose and discuss the view that automatic encoding of semantic representations related to number symbols in parietal cortex lead to shifts in visuo-spatial attention and enhanced visual processing in the occipital cortex according to number-space congruency rules.
http://hdl.handle.net/10993/18978

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