Oades, R.D., Zerbin, D. & Dittmann-Balcar (1995) A., The topography of event-related potentials in passive and active conditions of a 3-tone auditory oddball test. Int. J. Neurosci., 81, 249-264. (request a copy) . (view) Introduction: Normalized event-related potential (ERP) data were analysed for topographical differences of ERP amplitude or latency in two conditions of a 3-tone oddball paradigm. The aim was to compare perception-related features relating to tone-type (passive non-task condition) with focussed attention-related features (active discrimination of target from non-target) in 5 ERP components from 23 young healthy subjects. Methods: The tones used were a common standard (70%, 0.8 KHz), a deviant standard (15%, 2 KHz) and a 1.4 KHz tone (15%, t) that was also used as the target (T). Results: Conclusion: This report extends and qualifies well-known main effects of tone and condition through main site effects to lateral sites. It supports claims of multiple sources of ERP components, except for N1 and P2. The contributions of these sources are influenced by tone-features (from P1) and the presence or absence of focussed attention (from the N2-P3 complex). |