Oscillatory correlates of the primacy effect in episodic memory.

@article{citeulike:842104, abstract = {Both intracranial and scalp EEG studies have demonstrated that oscillatory activity, especially in the gamma band (28 to 100 Hz), can differentiate successful and unsuccessful episodic encoding [Sederberg, P.B., Kahana, M.J., Howard, M.W., Donner, E.J., Madsen, J.R., 2003. Theta and gamma oscillations during encoding predict subsequent recall. Journal of Neuroscience, 23(34), 10809-10814; Fell, J., Klaver, P., Lehnertz, K., Grunwald, T., Schaller, C., Elger, C.E., Fernandez, G., 2001. Human memory formation is accompanied by rhinal-hippocampal coupling and decoupling. Nature Neuroscience, 4 (12), 1259-1264; Gruber, T., Tsivilis, D., Montaldi, D., and M\"{u}ller, M. (2004). Induced gamma band responses: An early marker of memory encoding and retrieval. Neuroreport, 15, 1837-1841; Summerfield, C., Mangels, J.A., in press. Dissociable neural mechanisms for encoding predictable and unpredictable events. Journal of Cognitive Neuroscience]. Although the probability of recalling an item varies as a function of where it appeared in the list, the relation between the oscillatory dynamics of successful encoding and serial position remains unexplored. We recorded scalp EEG as participants studied lists of common nouns in a delayed free-recall task. Because early list items were recalled better than items from later serial positions (the primacy effect), we analyzed encoding-related changes in 2 to 100 Hz oscillatory power as a function of serial position. Increases in gamma power in posterior regions predicted successful encoding at early serial positions; widespread low-frequency (4-14 Hz) power decreases predicted successful memory formation for later serial positions. These results suggest that items in early serial positions receive an encoding boost due to focused encoding without having to divide resources among numerous list items. Later in the list, as memory load increases, encoding is divided between multiple items.}, address = {Department of Neuroscience, University of Pennsylvania, Philadelphia, PA 19104, USA.}, author = {Sederberg, P. B. and Gauthier, L. V. and Terushkin, V. and Miller, J. F. and Barnathan, J. A. and Kahana, M. J. }, citeulike-article-id = {842104}, doi = {10.1016/j.neuroimage.2006.04.223}, issn = {1053-8119}, journal = {Neuroimage}, keywords = {eeg, joo-seok, memory, oscillations}, month = {September}, number = {3}, pages = {1422--1431}, posted-at = {2006-09-13 19:56:25}, priority = {2}, title = {Oscillatory correlates of the primacy effect in episodic memory.}, url = {http://dx.doi.org/10.1016/j.neuroimage.2006.04.223}, volume = {32}, year = {2006} }

TY - JOUR ID - citeulike:842104 L3 - citeulike-article-id:842104 TI - Oscillatory correlates of the primacy effect in episodic memory. JF - Neuroimage VL - 32 IS - 3 SP - 1422 EP - 1431 AD - Department of Neuroscience, University of Pennsylvania, Philadelphia, PA 19104, USA. SN - 1053-8119 N2 - Both intracranial and scalp EEG studies have demonstrated that oscillatory activity, especially in the gamma band (28 to 100 Hz), can differentiate successful and unsuccessful episodic encoding [Sederberg, P.B., Kahana, M.J., Howard, M.W., Donner, E.J., Madsen, J.R., 2003. Theta and gamma oscillations during encoding predict subsequent recall. Journal of Neuroscience, 23(34), 10809-10814; Fell, J., Klaver, P., Lehnertz, K., Grunwald, T., Schaller, C., Elger, C.E., Fernandez, G., 2001. Human memory formation is accompanied by rhinal-hippocampal coupling and decoupling. Nature Neuroscience, 4 (12), 1259-1264; Gruber, T., Tsivilis, D., Montaldi, D., and Müller, M. (2004). Induced gamma band responses: An early marker of memory encoding and retrieval. Neuroreport, 15, 1837-1841; Summerfield, C., Mangels, J.A., in press. Dissociable neural mechanisms for encoding predictable and unpredictable events. Journal of Cognitive Neuroscience]. Although the probability of recalling an item varies as a function of where it appeared in the list, the relation between the oscillatory dynamics of successful encoding and serial position remains unexplored. We recorded scalp EEG as participants studied lists of common nouns in a delayed free-recall task. Because early list items were recalled better than items from later serial positions (the primacy effect), we analyzed encoding-related changes in 2 to 100 Hz oscillatory power as a function of serial position. Increases in gamma power in posterior regions predicted successful encoding at early serial positions; widespread low-frequency (4-14 Hz) power decreases predicted successful memory formation for later serial positions. These results suggest that items in early serial positions receive an encoding boost due to focused encoding without having to divide resources among numerous list items. Later in the list, as memory load increases, encoding is divided between multiple items. KW - eeg KW - joo-seok KW - memory KW - oscillations AU - Sederberg, PB AU - Gauthier, LV AU - Terushkin, V AU - Miller, JF AU - Barnathan, JA AU - Kahana, MJ PY - 2006/09// UR - http://dx.doi.org/10.1016/j.neuroimage.2006.04.223 ER -