| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4344925 | Neuroscience Letters | 2011 | 5 Pages |
In this paper, functional connectivity of steady-state visual evoked potential (SSVEP) was investigated. Directed transfer function (DTF) was applied to cortical signals recorded from electroencephalography (EEG) in order to obtain connectivity patterns. Flow gain was proposed to assess the role of the specific brain region involved in the information transmission process. We found network connections exist in many regions beyond occipital region. Flow gain mapping both in 8–12 Hz and 13–30 Hz showed that parietal region seemed to serve as the sole hub of information transmission. Further studies of flow gain obtained from channel Pz showed two distinct peaks centered at about 12 Hz low frequency and 20 Hz medium frequency respectively. The low frequency region had a larger value of flow gain. The present study introduced functional connectivity into SSVEP. Furthermore, we put forward the concept of flow gain for the first time to explore the exchange and processing of brain information during SSVEP.
► DTF was proved to be potentially useful for further investigation of SSVEP. ► Flow gain was defined for the first time. ► The results of the present study indicate that the parietal regions are a key neural locus of human visual perception. ► The connectivity pattern complex distributed properties underlying the SSVEP are organized as a more complex model. ► Flow gain obtained from channel Pz showed two distinct peaks centered at about 12 Hz low frequency and 20 Hz medium frequency respectively.
