Exploring The Causal Role Of Neural Oscillations In Endogenous And Exogenous Attention: Different Effects Of 40 Hz And 10 Hz Tacs Stimulation Public Deposited

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Last Modified
  • March 20, 2019
Creator
  • Parsons, Jonathan
    • Affiliation: College of Arts and Sciences, Department of Psychology and Neuroscience
Abstract
  • Previous electrophysiological studies strongly implicate a role for both alpha (8 – 12 Hz) and gamma (30 – 120 Hz) oscillations in selective attention. However, establishing causality requires inducing these oscillations in the brain and observing the behavioral changes that result. To this end, we stimulated participants’ right posterior parietal cortex at 10 Hz, 40 Hz or sham while they performed two separate cueing tasks—one endogenous and one exogenous. Stimulation at 40 Hz speeded responses to invalidly-cued targets, suggesting a facilitation of voluntary attentional shifting. There was also a marginal effect of 10 Hz stimulation, such that responses to invalidly-cued targets in the exogenous task were slowed. Possible reasons for a lack of lateralized effects are discussed. These results provide new information about the causal roles of different frequencies of neural oscillation in facilitating visuospatial attention, providing support for frequency-specific effects.
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Rights statement
  • In Copyright
Advisor
  • Mulligan, Neil
  • Boettiger, Charlotte
  • Hopfinger, Joseph
Degree
  • Master of Arts
Degree granting institution
  • University of North Carolina at Chapel Hill Graduate School
Graduation year
  • 2017
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