Are Visual Representations Phase-Coupled by Alpha Oscillations?
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Visual representations in the cortex are thought to be modulated by alpha oscillations. We used decoding techniques to verify this hypothesis. Attentional modulation is characterized by changes in alpha oscillations and it modulates visual processing. Since orientation information can be reliably decoded from neural activity with magnetoencephelography (MEG), this technique can be used to study modulations of visual processing. In this study, we investigated whether attention modulates decoding performance in the alpha band (8-12 Hz), such that decoding performance shows ~10 Hz rhythmicity. Although no conclusive answer was achieved, the study provides insightful data on the used methodology in studying modulation effects on decoding. Moreover, we have shown that the orientation of peripheral, drifting gratings can be decoded from MEG data.
Faculteit der Sociale Wetenschappen