Spatiotemporal dynamics and functional correlates of evoked neural oscillations with different spectral powers in human visual cortex

Song E. Kim, Won Sup Kim, Byung Gon Kim, Dongil Chung, Jaeseung Jeong, Jae Sung Lee, Woo Suk Tae, Seung Bong Hong, Hyang Woon Lee

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Objective: To investigate spatiotemporal characteristics and functional correlates of evoked oscillations (EOs) at different frequency bands in human visual cortex. Methods: Flash visual evoked potentials (FVEPs) were recorded from 11 epilepsy patients with intracranial electrodes placed over the occipital and adjacent cortices. Spatiotemporal characteristics of spectral powers and correlation with various visual responses elicited by electrical cortical stimulations were analyzed in the same electrodes. Results: High γ (60-150. Hz) EOs were first recorded in the cuneus and lingual gyri around the calcarine sulcus. Low γ (30-60. Hz) EOs appeared also in the mesial occipital cortex slightly later and lasted longer than high γ EGOs. In contrast, lower frequency (LF) <30. Hz EOs were recorded more diffusely from occipital surfaces with delayed onset and longer duration. High γ EOs were predominantly associated with simple form visual responses, whereas low γ and LF EOs were with intermediate form and LF EOs with complex form responses. Conclusions: FVEP spectral power analysis directly recorded from human visual cortex showed distinct spatiotemporal distributions in high and low γ, or LF bands that have different functional correlates. Significance: Phase-locked EOs in these frequency bands may have special neuroanatomical and functional organization during early visual processing.

Original languageEnglish
Pages (from-to)2248-2256
Number of pages9
JournalClinical Neurophysiology
Issue number11
StatePublished - Nov 2013

Bibliographical note

Funding Information:
We, the authors have no conflict of interests of any kind in the materials or services referred to in this article. This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology [ R01-2011-0015788 to H.W.L.] and the Ewha Global Top 5 Grant 2011 of Ewha Womans University, and by the Global Frontier R&D Program on funded by the National Research Foundation of Korea grant funded by the Korean Government (MEST) [2012M3A6A3056079 to S.B.H.].


  • Cortical localization
  • Evoked neural oscillations
  • Functional mapping
  • Intracranial electrode
  • Visual evoked potential (VEP)


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