Eye-Fixation Related Potentials on Regions of Interest when viewing natural scenes H Queste1, N Guyader2, A Guérin-Dugué1 |
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1Gipsa-lab Grenoble Images Parole Signal Automatique, Joseph Fourier University Grenoble, France |
| Eye-movements and EEG signals were recorded on participants viewing scenes under three tasks: free exploration (FE), categorization (indoor/outdoor) (CAT) or spatial organization that is to give the relative position between two objects (right/left) (SO). For each scene, some regions of interest (ROIs) and of non-interest (RONIs) were defined. ROIs were chosen as the most fixated areas during FE that moreover correspond to an object. RONIs were areas that were less fixated and did not correspond to an object. These ROIs and RONIs were used for FE and CAT. For SO, the ROIs corresponded to the objects of the question. Two kinds of ROI could be distinguished: the ROI useful for solving the task (SO) and the ROI not explicitly specified by the task (FE and CAT). We analyzed the EFRPs of two consecutive fixations that landed in ROIs and RONIs for the first time. A significant decrease of the P1 amplitude was observed on occipital electrodes for the second EFRPs when the fixations were inside ROIs. This decrease was observed both for ROIs explicitly specified by the task and for ROIs not linked with the task. No significant difference was observed between the first and the second EFRPs for RONIs. |
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