DU Undergraduate Showcase: Research, Scholarship, and Creative Works

DU Undergraduate Showcase: Research, Scholarship, and Creative Work

Evaluation of evoked potentials to dyadic tones after cochlear implantation

Auditory evoked potentials are tools widely used to assess auditory cortex functions in clinical context. However, in cochlear implant users, electrophysiological measures are challenging due to implant-created artefacts in the EEG. Here, we used independent component analysis to reduce cochlear implant-related artefacts in event-related EEGs of cochlear implant users (n = 12), which allowed detailed spatio-temporal evaluation of auditory evoked potentials by means of dipole source analysis. The present study examined hemispheric asymmetries of auditory evoked potentials to musical sounds in cochlear implant users to evaluate the effect of this type of implantation on neuronal activity. In particular, implant users were presented with two dyadic tonal intervals in an active oddball design and in a passive listening condition. Principally, the results show that independent component analysis is an efficient approach that enables the study of neurophysiological mechanisms of restored auditory function in cochlear implant users. Moreover, our data indicate altered hemispheric asymmetries for dyadic tone processing in implant users compared with listeners with normal hearing (n = 12). We conclude that the evaluation of auditory evoked potentials are of major relevance to understanding auditory cortex function after cochlear implantation and could be of substantial clinical value by indicating the maturation/reorganization of the auditory system after implantation

Choice or constraint?: the case of labour relations reform in South Africa

Presents 35 abstracts from the 2001 Employment Research Unit Annual conference held at Cardiff Business School in September 2001. Attempts to explore the theme of changing politics of employment relations beyond and within the nation state, against a background of concern in the developed economies at the erosion of relatively advanced conditions of work and social welfare through increasing competition and international agitation for more effective global labour standards. Divides this concept into two areas, addressing the erosion of employment standards through processes of restructuring and examining attempts by governments, trade unions and agencies to re-create effective systems of regulation. Gives case examples from areas such as India, Wales, London, Ireland, South Africa, Europe and Japan. Covers subjects such as the Disability Discrimination Act, minimum wage, training, contract workers and managing change