spectral dynamics of EEG during target discrimination in the auditory and visual modalities.
Published: 2004
Language: eng
Number of pages: 75
Description: Results. The spectrograms for the targets showed increases in frontal theta activity, decreases in alpha and beta activity and a decrease in central gamma activity. The decrease in the alpha and beta activity showed a topography that suggested a posterior alpha desynchronization specific for the visual task and a central desynchronization for both auditory and visual targets.Conclusion. ERPs and EEG spectral dynamics react differently during target detection. The spectral dynamics relate more to perceptual or motor processing (target or stimulus) whereas the ERPs are more affected by target detection.Objective. The purpose of this thesis was to examine the spectral changes in the EEG during target discrimination in the auditory and visual modalities.Methods. The basic paradigms were a visual and auditory "oddball" task wherein the subjects detected an improbable (p = 0.2) target in a train of standards occurring at a rate of 1/s. Target discriminability and attention were manipulated.
Notes: Adviser:  T. W. Picton.

Thesis (M.Sc.)--University of Toronto, 2004.

Electronic version licensed for access by U. of T. users.

Source: Masters Abstracts International, Volume: 42-06, page: 2123.

MICR copy on microfiche (1 microfiche).