Human Cerebral Activation during Steady-State Visual-Evoked Responses

Maria A. Pastor, Julio Artieda, Javier Arbizu, Miguel Valencia, Jose C. Masdeu

Research output: Contribution to journalArticlepeer-review

240 Scopus citations


Flicker stimuli of variable frequency (2-90 Hz) elicit a steady-state visual-evoked response (SSVER) in the electroencephalogram (EEG) with the same frequency as the stimulus. In humans, the amplitude of this response peaks at ∼15 Hz, decreasing at higher stimulation frequencies. It was not known whether this peak response corresponds to increased synaptic activity in the visual cortex or to other mechanisms [for instance, the temporal coherence (phase summation) of evoked responses]. We studied the SSVER in 16 normal volunteers by means of visual stimulation at 14 different frequencies (from 5 to 60 Hz) while recording the EEG. In nine subjects of the group, we measured regional cerebral blood flow (rCBF) with positron emission tomography (PET)-H2 15O at rest and during visual stimulation at five different frequencies: 5, 10, 15, 25, and 40 Hz. We confirmed that the amplitude of the SSVER in occipital regions peaks at 15 Hz stimulation. Applying to the PET rCBF data a contrast weighted by the amplitude of the SSVER, we determined that the primary visual cortex rCBF follows an activation pattern similar to the SSVER. This finding suggests that the amplitude of the SSVER corresponds to increased synaptic activity, specifically in Brodmann's area 17. Additionally, this study showed that visual stimulation at 40 Hz causes selective activation of the macular region of the visual cortex, and that a region in the dorsal aspect of the Crus I lobule of the left cerebellar hemisphere is activated during repetitive visual stimulation.

Original languageEnglish (US)
Pages (from-to)11621-11627
Number of pages7
JournalJournal of Neuroscience
Issue number37
StatePublished - Dec 17 2003


  • Cerebellum
  • Gamma oscillatory activity
  • Positron emission tomography
  • Regional cerebral blood flow
  • Steady-state visual-evoked potentials
  • Visual cortex

ASJC Scopus subject areas

  • Neuroscience(all)


Dive into the research topics of 'Human Cerebral Activation during Steady-State Visual-Evoked Responses'. Together they form a unique fingerprint.

Cite this