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• W1984433170 abstract "Abstract Background Magnetoencephalography (MEG) has become an increasingly popular technique for non-invasively characterizing neuromagnetic field changes in the brain at a high temporal resolution. To examine the reliability of the MEG signal, we compared magnetic and electrophysiological responses to complex natural stimuli from the same animals. We examined changes in neuromagnetic fields, local field potentials (LFP) and multi-unit activity (MUA) in macaque monkey primary somatosensory cortex that were induced by varying the rate of mechanical stimulation. Stimuli were applied to the fingertips with three inter-stimulus intervals (ISIs): 0.33s, 1s and 2s. Results Signal intensity was inversely related to the rate of stimulation, but to different degrees for each measurement method. The decrease in response at higher stimulation rates was significantly greater for MUA than LFP and MEG data, while no significant difference was observed between LFP and MEG recordings. Furthermore, response latency was the shortest for MUA and the longest for MEG data. Conclusion The MEG signal is an accurate representation of electrophysiological responses to complex natural stimuli. Further, the intensity and latency of the MEG signal were better correlated with the LFP than MUA data suggesting that the MEG signal reflects primarily synaptic currents rather than spiking activity. These differences in latency could be attributed to differences in the extent of spatial summation and/or differential laminar sensitivity." @default.
• W1984433170 created "2016-06-24" @default.
• W1984433170 creator A5011856129 @default.
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• W1984433170 date "2009-01-15" @default.
• W1984433170 modified "2023-10-16" @default.
• W1984433170 title "The relationship between magnetic and electrophysiological responses to complex tactile stimuli" @default.
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• W1984433170 doi "https://doi.org/10.1186/1471-2202-10-4" @default.
• W1984433170 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2652466" @default.
• W1984433170 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19146670" @default.
• W1984433170 hasPublicationYear "2009" @default.
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• W1984433170 citedByCount "27" @default.

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