There are 3 studies that match your criteria.
Criteria: Study Type=Human / Provocation,Freq Range=0 - 300 Hz (Static, ELF),Study Subtype=Cognitive Function & Memory

View This Study - Citation No: 2249
Title	ELECTRIC CURRENTS BOOST BRAIN POWER
Reference	Nature, Vol. 432, Pg. - , 2004
Author(s)	Giles J., Iyer N., Wassermann E.
PubMed UID
Project ID	1208
View This Study - Citation No: 3932
Title	DOES EXPOSURE TO EXTRMEMLY LOW FREQUENCY MAGNETIC FIELDS PRODUCE FUNCTIONAL CHANGES IN HUMAN BRAIN
Reference	J Neural Transm, Vol. 116, Pg. 257 - 265, 2009
Author(s)	Capone F., Dileone M., Profice P., Pilato F., Di Lazzaro V., et al .
PubMed UID	19189041
Project ID	1908
View This Study - Citation No: 4525
Title	EFFECTS OF EXTREMELY LOW-FREQUENCY MAGNETIC FIELD EXPOSURE ON COGNITIVE FUNCTIONS: RESULTS OF A META-ANALYSIS.
Reference	Bioelectromagnetics., Vol. 31, Pg. 173 - 179, 2010
Author(s)	Barth A., Ponocny I., Ponocny-Seliger E., Vana N., Winker R.
PubMed UID	19753600
Project ID	2067