Time-frequency representations of power were quantified using a multitapering approach (31) with the FieldTrip toolbox (46) for MATLAB (MathWorks Inc., Natick, MA). Study data segments were zero padded to the next power of 2, and the multitaper frequency spectrum was calculated by sliding a 250-ms window in 25-ms increments across 40 logarithmically spaced, partially overlapping frequency bands centered from 30 to 250 Hz, with 1/3 fractional bandwidth at each center frequency. We then separated the baseline (−450 to −150 ms from scene onset) and encoding (−150 to +3000 ms from scene onset) intervals for analysis.

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