Table 4.

Results of the time-frequency analysis

Cluster	Frequency range (Hz)	Duration (ms)	Significant electrodes	p
Retrieval versus encoding	4–30	456–2000	All channels	Negative, 0.004
Old versus new	4–28	580–2000	All but TP8	Negative, 0.012
Young versus elderly	12–30	200–1630	All but T8	Positive, 0.04
Retrieval versus encoding: young versus elderly	5–30	960–2000	All channels	Positive, 0.024
Old versus New: Young versus elderly	4–26	660–2000	All but P8 and TP8	Negative, 0.044