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- W349794092 abstract "Optical signals were recorded from slices of rat cingulate cortex stained with a voltage-sensitive dye (RH482) to analyze the propagation of neural activities evoked by electrical stimulation of afferent fibers in the white matter. Changes in optical absorption of the dye caused by neural activities were detected every 0.6 msec at a spatial resolution of 23 μm 2 /pixel. Neural activities spread vertically from the deep to the superficial layers, then propagated tangentially along the layers in the cerebral cortex. Analysis of the time course of optical signals in each pixel revealed three types of neural activity. The first type, identified near the stimulus site, showed a rapid increase that peaked within 1 msec, usually followed by a fast decay. The second type showed a gradual increase that peaked in 5-10 msec, then decayed at a comparable rate. The last type, identified mostly at the periphery of the activated area, showed a slower increase and decrease in neural activities with a small plateau value. Evidence suggests that the first type reflects synchronous action potentials of the afferent and/or efferent fibers evoked by stimulation, and that the second type reflects the synaptic activation of secondary or higher-order neurons of the cortical afferent fibers. The second type seemed to involve regenerative processes of neural activation necessary for tangential propagation." @default.
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- W349794092 date "1995-05-01" @default.
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- W349794092 title "Optical imaging of propagation of neural activities in rat cingulate cortex in vitro" @default.
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