Task-Dependent Oscillatory Brain Activity During Oculomotor Delayed Response Task

This study used three Oculomotor Delayed Response (ODR) tasks to investigate the unique cognitive demands during the delay period. Changes in alpha power were used to index cognitive efforts during the delay period. Continuous EEGs from 25 healthy young adults (18-34 years) were recorded using dense electrode array. The data was analyzed by 6-cycle Morlet wavelet decompositions in the frequency range of 2-30 Hz to create time- frequency decompositions for four midline electrode sites. The 99% confidence intervals using the bootstrapped 20% trimmed mean of the 10 Hz frequency were used to examine the differences among conditions. Compared to two Memory conditions (Match and Non-Match), Control condition yielded significant differences in all frequencies over the entire trial period, suggesting a cognitive state difference. Compared to Match condition, the Non–Match condition had lower alpha activity during the delay period at each midline electrode site reflecting the higher cognitive effort required.

Name thesis:degree_name

M.A. Child and Youth Studies

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Faculty of Social Sciences

Department dc:contributor.department

Department of Child and Youth Studies

Grantor

Brock University

Year dc:date.issued

2014

Author dc:creator

• Nichol, Melissa

• Electrophysiology
• Oculomotor delayed response task
• Oscillations
• Alpha frequency
• Working memory

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/10464/5404

OAI identifier oai:identifier

oai:brocku.scholaris.ca:10464/5404