?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=The+topography+of+4+subtraction+ERP-waveforms+derived+from+a+3-tone+auditory+oddball+task+in+healthy+young+adults&rft.creator=Oades%2C+Robert+D.&rft.creator=Dittmann-Balcar%2C+&rft.creator=Zerbin%2C+&rft.subject=Neurophysiology&rft.subject=Perceptual+Cognitive+Psychology&rft.subject=Psychophysics&rft.description=Introduction%3A+Five+components+were+studied+in+4+subtraction+waveforms+derived+from+ERPs+obtained+in+passive+and+active+conditions+of+a+3-tone+oddball+task+(common%3D70%25%2C+C%2C+0.8+KHz%3B+deviant%3D15%25%2C+D%2C+2+KHz%3B+1.4+KHz%3D15%25%2C+t%2C+also+used+as+a+target+(T)).+These+waveforms+reflect+different+stimulus-mismatch+processes+and+thus+their+topography+could+be+revealing+of+different+brain+regions+mediating+them.+%0A%0A%0A%0AMethods%3A+The+following+mismatches+were+studied%3A+stimulus-mismatch+(deviant+-+common%2C+D%2FC%2C+rarity+and+pitch+confounded%2C+known+as+the+mismatch+negativity%2C+MMN)%2C+pitch-mismatch+(T+-+deviant%2C+T%2FD%2C+rarity+not+target+features+controlled%2C+known+as+processing+negativity+PN)%2C+attention+-+mismatch+(T+-+t)%2C+T%2Ft%2C+controlled+for+pitch+and+rarity+to+show+the+influence+of+target+features%2C+known+as+the+Negative+difference+Nd).+These+are+compared+with+Goodin's+procedure+(G-wv%2C+(T-common+(active)+-+(t-common+(passive)-+the+%22Goodin-waveform%22).++%0A%0AResults%3A+There+were+main+site+effects+in+normalized+data+in+all+cases+(not+P2+and+N2+latency).+There+were+separate+frontal+and+posterior+contributions+to+P1%2C+with+the+former+emphasized+where+target+comparisons+were+involved.+%0AFrontal+N1+peaks%2C+largest+in+D%2FC+(MMN)%2C+spread+posterior+and+to+the+right+where+target+matching+was+involved.+P2+posterior+maxima+were+also+less+localized+where+target+features+were+involved+in+the+comparison.+N2+topography+was+similar+between+waveforms+but+spread+slightly+more+to+each+side+in+the+T%2Ft+comparison+(i.e.+Nd).+%0AOnset+was+earlier+in+the+D%2FC+comparison+(i.e+MMN).+Parietal+P3+peaks+in+waves+based+on+target-ERPs+showed+a+left+temporal+shift+(vs+D%2FC)%2C+though+in+T%2FD+P3+was+in+fact+maximal+on+the+right+(i.e.+PN+waveform).+%0A%0AConclusions%3A+Thus+an+attentional+effect(controlled+processing)+is+evident+as+early+as+60+ms.+Target+features+modify+the+anteroposterior+distribution+of+positivity+and+negativity+for+the+early+components+and+in+the+lateralization+of+P3-like+positivity.+A+comparison+of+waveforms+by+latency+of+potential+shift+(running+t-test)+vs.+peak+identification+(MANOVA)+is+illustrated+and+discussed.+D%2FC+(MMN)+and+T%2Ft+(Nd)+waveforms%2C+rather+than+T%2FD+or+G-wv+(PN+%26+Goodin+waveforms)+waveforms+are+recommended+for+distinguishing+comparator+mechanisms+for+stimulus-+and+task-relevant+features.++%0A%0A&rft.publisher=Gordon+%26+Breach&rft.date=1995&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F1225%2F2%2FInt.J.Neurosc95%25282%2529.pdf&rft.identifier=++Oades%2C+Robert+D.+and+Dittmann-Balcar%2C++and+Zerbin%2C+++(1995)+The+topography+of+4+subtraction+ERP-waveforms+derived+from+a+3-tone+auditory+oddball+task+in+healthy+young+adults.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F1225%2F