Direction of magnetoencephalography sources associated with feedback and feedforward contributions in a visual object recognition task.

Abstract

Identifying inter-area communication in terms of the hierarchical organization of functional brain areas is of considerable interest in human neuroimaging. Previous studies have suggested that the direction of magneto- and electroencephalography (MEG, EEG) source currents depend on the layer-specific input patterns into a cortical area. We examined the direction in MEG source currents in a visual object recognition experiment in which there were specific expectations of activation in the fusiform region being driven by either feedforward or feedback inputs. The source for the early non-specific visual evoked response, presumably corresponding to feedforward driven activity, pointed outward, i.e., away from the white matter. In contrast, the source for the later, object-recognition related signals, expected to be driven by feedback inputs, pointed inward, toward the white matter. Associating specific features of the MEG/EEG source waveforms to feedforward and feedback inputs could provide unique information about the activation patterns within hierarchically organized cortical areas.

DOI: 10.1016/j.neulet.2014.11.029

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@article{Ahlfors2015DirectionOM, title={Direction of magnetoencephalography sources associated with feedback and feedforward contributions in a visual object recognition task.}, author={Seppo P. Ahlfors and Stephanie R. Jones and Jyrki Ahveninen and Matti S. H{\"a}m{\"a}l{\"a}inen and John W. Belliveau and Moshe Bar}, journal={Neuroscience letters}, year={2015}, volume={585}, pages={149-54} }