Dataset Information

Formation of visual memories controlled by gamma power phase-locked to alpha oscillations.

ABSTRACT: Neuronal oscillations provide a window for understanding the brain dynamics that organize the flow of information from sensory to memory areas. While it has been suggested that gamma power reflects feedforward processing and alpha oscillations feedback control, it remains unknown how these oscillations dynamically interact. Magnetoencephalography (MEG) data was acquired from healthy subjects who were cued to either remember or not remember presented pictures. Our analysis revealed that in anticipation of a picture to be remembered, alpha power decreased while the cross-frequency coupling between gamma power and alpha phase increased. A measure of directionality between alpha phase and gamma power predicted individual ability to encode memory: stronger control of alpha phase over gamma power was associated with better memory. These findings demonstrate that encoding of visual information is reflected by a state determined by the interaction between alpha and gamma activity.

SUBMITTER: Park H

PROVIDER: S-EPMC4910116 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature

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Formation of visual memories controlled by gamma power phase-locked to alpha oscillations.

Park Hyojin H Lee Dong Soo DS Kang Eunjoo E Kang Hyejin H Hahm Jarang J Kim June Sic JS Chung Chun Kee CK Jiang Haiteng H Gross Joachim J Jensen Ole O

Scientific reports 20160616

Neuronal oscillations provide a window for understanding the brain dynamics that organize the flow of information from sensory to memory areas. While it has been suggested that gamma power reflects feedforward processing and alpha oscillations feedback control, it remains unknown how these oscillations dynamically interact. Magnetoencephalography (MEG) data was acquired from healthy subjects who were cued to either remember or not remember presented pictures. Our analysis revealed that in antici ...[more]

PMID: 27306959

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Project description:Recent psychophysical studies have demonstrated that periodic attention in the 4-8 Hz range facilitates performance on visual detection. The present study examined the periodicity of feature binding, another major function of attention, in human observers (3 females and 5 males for behavior, with 7 males added for the EEG experiment). In a psychophysical task, observers reported a synchronous pair of brightness (light/dark) and orientation (clockwise/counterclockwise) patterns from two combined brightness-orientation pairs presented in rapid succession. We found that temporal binding performance exhibits periodic oscillations at ?8 Hz as a function of stimulus onset delay from a self-initiated button press in conditions where brightness-orientation pairs were spatially separated. However, as one would expect from previous studies on pre-attentive binding, significant oscillations were not apparent in conditions where brightness-orientation pairs were spatially superimposed. EEG results, while fully compatible with behavioral oscillations, also revealed a significant dependence of binding performance across trials on prestimulus neural oscillatory phases within the corresponding band. The peak frequency of this dependence was found to be correlated with intertrial phase coherence (ITPC) around the timing of button press in parietal sensors. Moreover, the peak frequency of the ITPC was found to predict behavioral frequency in individual observers. Together, these results suggest that attention operates periodically (at ?8 Hz) on the perceptual binding of multimodal visual information and is mediated by neural oscillations phase-locked to voluntary action.SIGNIFICANCE STATEMENT Recent studies in neuroscience suggest that the brain's attention network operates rhythmically at 4-8 Hz. The present behavioral task revealed that attentional binding of visual features is performed periodically at ?8 Hz, and EEG analysis showed a dependence of binding performance on prestimulus neural oscillatory phase. Furthermore, this association between perceptual and neural oscillations is triggered by voluntary action. Periodic processes driven by attention appear to contribute not only to sensory processing but also to the temporal binding of diverse information into a conscious event synchronized with action.

Dataset Information

Formation of visual memories controlled by gamma power phase-locked to alpha oscillations.

Publications

Formation of visual memories controlled by gamma power phase-locked to alpha oscillations.

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