Abstract
In the present exploratory study based on 7 subjects, we examined the composition of magnetoencephalographic (MEG) brain oscillations induced by the presentation of an auditory, visual, and audio–visual stimulus (a talking face) using an oddball paradigm. The composition of brain oscillations were assessed here by analyzing the probability-classification of short-term MEG spectral patterns. The probability index for particular brain oscillations being elicited was dependent on the type and the modality of the sensory percept. The maintenance of the integrated audio–visual percept was accompanied by the unique composition of distributed brain oscillations typical of auditory and visual modality, and the contribution of brain oscillations characteristic for visual modality was dominant. Oscillations around 20 Hz were characteristic for the maintenance of integrated audio–visual percept. Identifying the actual composition of brain oscillations allowed us (1) to distinguish two subjectively/consciously identical mental percepts, and (2) to characterize the types of brain functions involved in the maintenance of the multi-sensory percept.
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Acknowledgments
The authors thank Riikka Möttönen for the MEG registration. MEG recordings were made in the Brain Research Unit at the Low Temperature Laboratory at the Helsinki University of Technology. The authors wish to thank Carlos Neves, computer science specialist, for the software development and technical support. Special thanks to Simon Johnson for skilful language editing. AAFs were supported by Research Fellowship from CIMO, Finland. Preparation of this article was supported by BM-SCIENCE. The authors state that experiment of this study complied with the current laws of Finland.
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Brain Oscillations and Auditory, Visual and Audio–Visual Speech Percepts.
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Fingelkurts, A.A., Fingelkurts, A.A. & Krause, C.M. Composition of brain oscillations and their functions in the maintenance of auditory, visual and audio–visual speech percepts: an exploratory study. Cogn Process 8, 183–199 (2007). https://doi.org/10.1007/s10339-007-0175-x
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DOI: https://doi.org/10.1007/s10339-007-0175-x