Le lundi 4 juillet 2016, le LPNC a invité le Jessica McFadyen (université du Queensland, Australie) pour un séminaire intitulé « A rapid and potentially generalised subcortical pathway to the amygdala: an MEG/DCM study ». Ce séminaire aura lieu à 13h à l’ARSH.
The idea that there is a colliculo-pulvinar pathway to the amygdala has been highly debated but converging evidence is in favour of its existence. It is believed that this pathway transmits low spatial frequency information to facilitate rapid emotion processing. Direct evidence for this hypothesis, however, is severely lacking. Using magnetoencephalography (MEG) and dynamic causal modelling (DCM), we found evidence for a rapid (~70ms onset in simulated amygdala activity) subcortical pathway. Activity along the predicted cortical pathway was significantly greater for high than low spatial frequency. Modulation of the subcortical pathway, however, was shown to be unlikely. This suggests that the function of the subcortical pathway may not be related to spatial frequency per se but perhaps another aspect of visual threat perception.
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