Abstract
In real-world situations, the integration of sensory information in working memory (WM) is an important mechanism for the recognition of objects. Studies in single sensory modalities show that object recognition is facilitated if bottom-up inputs match a template held in WM, and that this effect may be linked to enhanced synchronization of neurons in the gamma-band (>30 Hz). Natural objects, however, frequently provide inputs to multiple sensory modalities. In this EEG study, we examined the integration of semantically matching or non-matching visual and auditory inputs using a delayed visual-to-auditory object-matching paradigm. In the event-related potentials (ERPs) triggered by auditory inputs, effects of semantic matching were observed after 120–170 ms at frontal and posterior regions, indicating WM-specific processing across modalities, and after 250–400 ms over medial-central regions, possibly reflecting the contextual integration of sensory inputs. Additionally, total gamma-band activity (GBA) with medial-central topography after 120–180 ms was larger for matching compared to non-matching trials. This demonstrates that multisensory matching in WM is reflected by GBA and that dynamic coupling of neural populations in this frequency range might be a crucial mechanism for integrative multisensory processes.
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Acknowledgments
We thank Kriemhild Saha and Inga Fitzner for help during data acquisition and Inga Schepers and Hanna Krause for help during data acquisition and analysis. D.S. received support from a NARSAD 2006 young investigator award and the German Research Foundation (SE 1859/1-1). A.K.E. acknowledges support by the European Union (IST-2005-027268, NEST-PATH-043457, HEALTH-F2-2008-200728), the German Research Foundation (GRK 1247/1), the German Federal Ministry of Education and Research (01GW0561) and the Volkswagen Foundation (II/80609).
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Daniel Senkowski and Till R. Schneider contributed equally to the manuscript.
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Senkowski, D., Schneider, T.R., Tandler, F. et al. Gamma-band activity reflects multisensory matching in working memory. Exp Brain Res 198, 363–372 (2009). https://doi.org/10.1007/s00221-009-1835-0
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DOI: https://doi.org/10.1007/s00221-009-1835-0
Keywords
- Multisensory
- Crossmodal
- Working memory
- Gamma
- EEG