Neurophysiological correlates of preparation for action measured by electroencephalography

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/486 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/486 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/486 archive 4031 disk0/00/00/01/79 2008-11-25 15:27:19 2019-01-23 09:51:40 2011-07-19 16:13:51 thesis show 0 Kourtis Dimitrios DXK457@bham.ac.uk Praamstra Peter University of Birmingham Neurophysiological correlates of preparation for action measured by electroencephalography unpub RC0321 BF 10col_life EEG, electroencephalography, motor control, preparation for action The optimal performance of an action depends to a great extend on the ability of a person to prepare in advance the appropriate kinetic and kinematic parameters at a specific point in time in order to meet the demands of a given situation and to foresee its consequences to the surrounding environment. In the research presented in this thesis, I employed high-density electroencephalography in order to study the neural processes underlying preparation for action. A typical way for studying preparation for action in neuroscience is to divide it in temporal preparation (when to respond) and event preparation (what response to make). In Chapter 2, we identified electrophysiological signs of implicit temporal preparation in a task where such preparation was not essential for the performance of the task. Electrophysiological traces of implicit timing were found in lateral premotor, parietal as well as occipital cortices. In Chapter 3, explicit temporal preparation was assessed by comparing anticipatory and reactive responses to periodically or randomly applied external loads, respectively. Higher (pre)motor preparatory activity was recorded in the former case, which resulted in lower post-load motor cortex activation and consequently to lower long-latency reflex amplitude. Event preparation was the theme of Chapter 4, where we introduced a new method for studying (at the source level) the generator mechanisms of lateralized potentials related to response selection, through the interaction with steady-state somatosensory responses. Finally, in Chapter 5 we provided evidence for the existence of concurrent and mutually inhibiting representations of multiple movement options in premotor and primary motor areas. 2008-12 graduation 2731895 eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 314 University of Birmingham School of Psychology d_ph na 2008-12 graduation