Abstract：
:Recent animal studies highlighting the relationship between functional imaging signals and the underlying neuronal activity have revealed the potential capabilities of non-invasive methods. However, the valuable exchange of information between animal and human studies remains restricted by the limited evidence of direct physiological links between species. In this study we used magnetoencephalography (MEG) to investigate the occurrence of 30-70 Hz (gamma) oscillations in human visual cortex, induced by the presentation of visual stimuli of varying contrast. These oscillations, well described in the animal literature, were observed in retinotopically concordant locations of visual cortex and show striking similarity to those found in primate visual cortex using surgically implanted electrodes. The amplitude of the gamma oscillations increases linearly with stimulus contrast in strong correlation with the gamma oscillations found in the local field potential (LFP) of the macaque. We demonstrate that non-invasive magnetic field measurements of gamma oscillations in human visual cortex concur with invasive measures of activation in primate visual cortex, suggesting both a direct representation of underlying neuronal activity and a concurrence between human and primate cortical activity.
journal_name
Neuroimagejournal_title
NeuroImageauthors
Hall SD,Holliday IE,Hillebrand A,Singh KD,Furlong PL,Hadjipapas A,Barnes GRdoi
10.1016/j.neuroimage.2005.01.009keywords:
subject
Has Abstractpub_date
2005-05-15 00:00:00pages
13-7issue
1eissn
1053-8119issn
1095-9572pii
S1053-8119(05)00034-0journal_volume
26pub_type
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