LEARNING AND MEMORYBrain oscillatory 4–30 Hz electroencephalogram responses in adolescents during a visual memory taskKrause, Christina M.a; Pesonen, Mirkaa; Hämäläinen, Heikkib c Author Information aCognitive Science, Institute of Behavioral Sciences, University of Helsinki bCentre for Cognitive Neuroscience cDepartment of Behavioral Sciences and Philosophy, University of Turku, Finland Correspondence to Professor Christina M. Krause, PhD, Cognitive Science, Institute of Behavioral Sciences, University of Helsinki, Finland, PO Box 9, Helsinki 00014, Finland Tel: +358 500 699972; fax: +358 9 191 29 542; e-mail: [email protected] Received 19 April 2010 accepted 11 May 2010 NeuroReport: August 4, 2010 - Volume 21 - Issue 11 - p 767-771 doi: 10.1097/WNR.0b013e32833bfcbb Buy Metrics Abstract Brain oscillatory responses of the 4–30 Hz electroencephalogram frequencies were assessed in 12 adolescents (mean age 14 years) during a visual N-back task with four memory load conditions (0-back, 1-back, 2-back, and 3-back). Theta frequency range (approximately 4–6 Hz) responses were elicited in all memory load conditions. The magnitude and duration of alpha frequency range (approximately 8–12 Hz) responses varied as a function of memory load. Beta frequency range (approximately 15–20 Hz) responses were modulated by both task difficulty and cognitive strategy. The differences between the memory load conditions were most prominent between the 0-back and 1-back conditions in the approximately 10 and 20 Hz electroencephalogram frequencies. Dynamic alpha and beta rhythm brain oscillatory responses are related to the cognitive processes in adolescence. © 2010 Lippincott Williams & Wilkins, Inc.