To-and-fro optical voltage signal propagation between the insular gustatory and parietal oral somatosensory areas in rat cortex slices

Brain Research
Hiroshi YoshimuraNorihiko Onoda

Abstract

Taste perception depends not only on special taste information processed in the insular cortex, but also on oral somesthetic processing in the parietal cortex. Many insular cortex neurons show multimodal responsiveness. Such multimodality may be enabled by signal exchange between these two cortices. By using the protocol that we have developed, a synchronized population oscillation of synaptic potentials was induced in the parietal cortex by stimulation to the insular cortex in rat neocortex slices. The spatiotemporal pattern of propagation of this oscillation was studied by recording voltage-sensitive optical signals and field potentials. The first wavelet of the oscillation was propagated from the insular stimulation site to the parietal cortex. However, the second and later wavelets propagated back from the parietal cortex to the insular cortex. The oscillation was detected in the insular cortex as well, but was actually generated in the parietal cortex. Thus, the initial peak of optical signal, sent from the insular to parietal cortex, served to generate oscillatory responses in the parietal cortex, which propagated back to the insular cortex wave-by-wave. We propose that this to-and-fro propagation may be an artificially e...Continue Reading

References

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Citations

May 5, 2012·Current Opinion in Neurobiology·Arianna MaffeiAlfredo Fontanini
Mar 29, 2014·European Journal of Oral Sciences·Mamichi Kawabe, Hiroshi Yoshimura
Jul 18, 2006·Current Opinion in Neurobiology·Lauren M JonesDonald B Katz
May 9, 2019·Brain Imaging and Behavior·Bo-Yong ParkHyunjin Park

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