Figure 3. Subsequent memory effect in the gamma band.

A subsequent memory effect was observed in the gamma band (55–65 Hz over left central sensors) when comparing later remembered to later forgotten LTM trials. The effect was significant when considering the first half of the retention interval and including only left fronto-central sensors. The right panel shows the difference in gamma activity when normalized with the variance (z-values) and confirms that the dominant effect is indeed at left central sensors.