“…In addition to SEF, several investiga tors have evaluated other ad hoc indices of data quantification. [28][29][30][31] These include, but are not limited to: (1) median power fre quency; (2) peak power frequency for the high-frequency band; (3) total power; (4) relative or absolute power in a particular frequency band; and (5) power-weighted average frequency. In general, none of these methods for reducing complex data to a single value has proved sufficiently val uable for representation of the EEG, al though research still continues in that direction.…”