Topography of the N400: brain electrical activity reflecting semantic expectancy. Export

@article{citeulike:3113844, abstract = {When subjects read an semantically unexpected word, the brain electrical activity shows a negative deflection at about 400 msec in comparison with the response to an expected word. In order to study the brain systems related to this effect we mapped it with a dense (64-channel) electrode array and two reference-independent measures, one estimating the average potential gradients and the other radial current density. With these measures, the event-related brain potential (ERP) begins at about 70 msec with the P1, reflecting bilateral current sources over occipitoparietal areas. A strongly left-lateralized N1 then follows, peaking at about 180 msec, accompanied by an anterior positivity, the P2. A separate posterior positive pattern then emerges that seems to repeat the topography of the P1. Next, at about 350 msec, the ERP for the congruous word develops a P300 or LPC, characterized by a diffuse positivity over the superior surface of the head and several negativities over inferior regions. This superior source/inferior sink pattern of the LPC is greater over the left hemisphere. In contrast, the ERP for the incongruous word in this interval displays the N400 as a period in which topographic features are absent. At about 400 msec the ERP for the incongruous word begins to develop an LPC, which then remains relatively symmetric over the two hemispheres.}, address = {Department of Psychology, University of Oregon, Eugene 97403.}, author = {Curran, T. and Tucker, D. M. and Kutas, M. and Posner, M. I.}, citeulike-article-id = {3113844}, citeulike-linkout-0 = {http://view.ncbi.nlm.nih.gov/pubmed/7684968}, citeulike-linkout-1 = {http://www.hubmed.org/display.cgi?uids=7684968}, issn = {0013-4694}, journal = {Electroencephalography and clinical neurophysiology}, keywords = {erps, n400, p1, semantic}, number = {3}, pages = {188--209}, posted-at = {2009-11-07 20:15:03}, priority = {2}, title = {Topography of the N400: brain electrical activity reflecting semantic expectancy.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/7684968}, volume = {88}, year = {1993} }

TY - JOUR ID - citeulike:3113844 L3 - citeulike-article-id:3113844 N2 - When subjects read an semantically unexpected word, the brain electrical activity shows a negative deflection at about 400 msec in comparison with the response to an expected word. In order to study the brain systems related to this effect we mapped it with a dense (64-channel) electrode array and two reference-independent measures, one estimating the average potential gradients and the other radial current density. With these measures, the event-related brain potential (ERP) begins at about 70 msec with the P1, reflecting bilateral current sources over occipitoparietal areas. A strongly left-lateralized N1 then follows, peaking at about 180 msec, accompanied by an anterior positivity, the P2. A separate posterior positive pattern then emerges that seems to repeat the topography of the P1. Next, at about 350 msec, the ERP for the congruous word develops a P300 or LPC, characterized by a diffuse positivity over the superior surface of the head and several negativities over inferior regions. This superior source/inferior sink pattern of the LPC is greater over the left hemisphere. In contrast, the ERP for the incongruous word in this interval displays the N400 as a period in which topographic features are absent. At about 400 msec the ERP for the incongruous word begins to develop an LPC, which then remains relatively symmetric over the two hemispheres. IS - 3 JF - Electroencephalography and clinical neurophysiology SN - 0013-4694 AD - Department of Psychology, University of Oregon, Eugene 97403. EP - 209 TI - Topography of the N400: brain electrical activity reflecting semantic expectancy. VL - 88 SP - 188 KW - erps KW - n400 KW - p1 KW - semantic AU - Curran, T AU - Tucker, DM AU - Kutas, M AU - Posner, MI PY - 1993///n UR - http://view.ncbi.nlm.nih.gov/pubmed/7684968 ER -