Tracking temporal and spatial dynamics of visual object recognition with combined MEG and fMRI R Cichy1, D Pantazis2, A Oliva1 |
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1CSAIL, MIT, MA, United States |
| The emergence of modern imaging techniques has led to considerable progress in characterizing the spatial and temporal processes of where and when course object recognition happens in the brain. Even though studies have often produced corroborating results, merging findings across methods remains challenging, because of differences in data types, sensitivities, and experimental paradigms. To leverage the spatial and temporal resolution of different imaging techniques, we measured brain responses to 92 different object images with fMRI and MEG, and combined data from these modalities using a common similarity space. The results provide new knowledge on two fundamental questions of object processing: 1) What is the time course of object processing at different levels of categorization? Multivariate analysis of MEG data shows that human brain responses can be decoded for a large set of objects, distinguishing in time between individual, basic and superordinate level of categorization (animate/inanimate, faces/bodes). 2) What is the relation between spatially and temporally resolved brain responses in a content-sensitive manner? We show a correspondence between early MEG and fMRI responses in early visual areas, and later MEG responses and fMRI in inferior-temporal (IT) cortex. |
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