Theta band power in the human scalp EEG and the encoding of new information

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TASK-related band power changes in the theta and alpha bands were examined during the encoding of new information in an implicit memory paradigm. The results showed significantly higher theta power during the encoding of those words which could be remembered in the later recall task, compared with words which could not be remembered later. In contrast to the theta band, alpha band power decreased during encoding. However, remembered words, compared with not remembered words did not show significant differences in the the alpha band. The increase in theta power during the successful encoding of new information is discussed with respect to a possible relationship with hippocampal theta, induced in the cortex via hippocampo-cortical feedback loops.

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