Brain Topography

, Volume 20, Issue 2, pp 97–104

The Influence of Cognitive Tasks on Different Frequencies Steady-state Visual Evoked Potentials

Authors

  • Zhenghua Wu
    • Center of NeuroInformatics, School of Life Science and TechnologyUniversity of Electronic Science and Technology of China
    • Center of NeuroInformatics, School of Life Science and TechnologyUniversity of Electronic Science and Technology of China
Original Paper

DOI: 10.1007/s10548-007-0035-0

Cite this article as:
Wu, Z. & Yao, D. Brain Topogr (2007) 20: 97. doi:10.1007/s10548-007-0035-0

Abstract

Previous studies suggested that there exists different neural networks for different frequency bands of steady-state visual evoked potential (SSVEP). What is the effect of the same cognitive task on different frequency SSVEPs? In this work, when a subject was conducting a graded memory task, a 8.3 or 20 Hz flicker was used as a background stimulation. The recorded EEGs were analyzed by the method of steady-state probe topography (SSPT), the results showed that SSVEPs under these two flicker conditions were similar to each other in the various stages of memory process, and were similar to the result of a high alpha band SSVEP as reported before. However, the SSVEP amplitude and latency in the lower frequency band is more clear and stable than that in the higher frequency band. These results suggest that the same cognitive task affects the different frequency SSVEP in a similar way, and the low frequency flicker is a better choice than the high frequency one in such as working memory study.

Keywords

Steady-state visual evoked potential (SSVEP)Steady-state probe topography (SSPT)Memory taskFlicker

Copyright information

© Springer Science+Business Media, LLC 2007