8 avril 2008
Olivier David présentera "Dynamic causal modelling of the ventral visual stream during emotional information processing"
- Intervenant : Olivier David
- Laboratoire : GIN - Institut des Neurosciences Grenoble
- Date prévue : 8 avril 2008 à
- Lieu : à déterminer
- Titre : Dynamic causal modelling of the ventral visual stream during emotional information processing
- Abstract : Visual attention can be driven by the affective significance of stimuli prior to full-fledged visual processing. Alternative explanatory models have been proposed to explain this influence: models including sequential processing along the ventral visual stream, and secondary feedback from emotion-related structures ("two-stage models"); and models involving in addition bypass short-cut pathways directly reaching the emotion-related structures ("two-pathway models"). We tested which type of model would best predict real magnetoencephalographic responses in subjects presented with arousing visual stimuli using realistic models of neural biophysics and large-scale cerebral architecture. The results strongly support a "two-pathway" hypothesis. Standard models including the retinotectal pathway and non standard models including cortical-cortical long range fasciculi appear both plausible.
