Event-Related Delta and Theta Responses By Tactile Stimuli
Journal Title: Journal of Neurological Sciences-Turkish - Year 2008, Vol 25, Issue 2
Abstract
The aim of this study was to investigate the delta and theta oscillatory responses to tactile stimuli by using oddball paradigm. The measurements were performed with eighteen subjects (21.39±2.75 ages; 12 male). Single type of tactile stimuli was applied to two fingers on the right hand: frequent (non-target) tactile stimuli and targets. The target (25%) stimuli were presented on index finger and nontarget stimuli (75%) were presented on middle finger randomly. Subjects counted the target stimuli mentally. The electroencephalogram (EEG) was recorded from 64 channels, 14 of which (F3, F4, FZ, CZ, C3, C4, T7, T8, P3, P4, P7, P8, O1, O2) were primarily analyzed. Peak-to-peak maximum amplitudes and prolongations of delta (0.5-3.5 Hz) and theta (4-7 Hz) were measured in 1000 ms following stimuli. The repeated measures ANOVA test was used for statistical analysis. Delta responses to target stimuli were higher than nontarget stimuli at F3, F4, FZ, CZ, C3, T7, P3, P4, P7, P8 and O2 recording sites. Delta responses to target stimuli were more prolonged than nontarget stimuli at F3, F4, FZ, C3, C4, T7, P3, P4, and O1. Theta responses to target stimuli were more prolonged than non-targets at F3, F4, Cz, C4, P3, O1 and O2 In tactile oddball paradigm, delta and theta responses to the both stimuli were highly distributed on the scalp. Furthermore, delta and theta oscillations have been differentiated for the target and nontarget stimuli, possibly serving as a reference for future physiological and clinical applications.
Authors and Affiliations
Adile ONIZ, Cagdas GUDUCU, Burcu AYDIN, Murat OZGOREN
Keywords
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