Gamma and Theta/Alpha-Band Oscillations in the Electroencephalogram Distinguish the Content of Inner Speech.

Contrary to our hypothesis, there was no difference in gamma-band activity in the N1 time window between the Match and Mismatch conditions, in spite of the highly significant differences in N1 amplitude.

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While this difference did not reach statistical significance, it did trend in that direction and thus may provide at least partial support for the prediction that if inner speech elicits a corollary discharge with detailed auditory properties, then N1 amplitude should be reduced in Mismatch compared with Passive, as there is presumably a greater degree of overlap in the auditory properties between /BA/ and /BI/ in the Mismatch condition than between /BA/ and nothing in the Passive condition ( Patel, 2022 ).

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