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- W2120284757 abstract "The oscillatory properties of the membrane potential in inferior olivary neurones were studied in guinea-pig brain-stem slices maintained in vitro. Intracellular double-ramp current injection at frequencies of 1-20 Hz revealed that inferior olivary neurones tend to fire at two preferred frequencies: 3-6 Hz when the cells were actively depolarized (resting potential less than -50 mV), and 9-12 Hz when they were actively hyperpolarized (resting potential more than -75 mV). In 10% of the experiments spontaneous subthreshold oscillations of the membrane potential were observed. These oscillations, which resembled sinusoidal wave forms and had a frequency of 4-6 Hz and an amplitude of 5-10 mV, occurred synchronously in all cells tested within the slice. These oscillations persisted in the presence of 10(-4) M-tetrodotoxin and were blocked by Ca2+ conductance blockers or by the removal of Ca2+ from the bathing solution. The oscillations were affected by gross extracellular stimulation of the slice but not by intracellular activation of any given neurone. The data indicate that these oscillations reflect the properties of neuronal ensembles comprised of a large number of coupled elements. Similar ensemble oscillation could be induced, in most experiments, by adding harmaline (0.1 mg/ml) and serotonin (10(-4) M) to the bath and could be blocked by bath addition of noradrenaline. Harmaline was found to increase cell excitability by hyperpolarizing the neurones and shifting the inactivation curve for the somatic Ca2+ spike to a more positive membrane potential level. The role inferior olivary oscillations play in the organization of motor coordination is discussed." @default.
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- W2120284757 date "1986-07-01" @default.
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- W2120284757 title "Oscillatory properties of guinea-pig inferior olivary neurones and their pharmacological modulation: an in vitro study." @default.
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- W2120284757 doi "https://doi.org/10.1113/jphysiol.1986.sp016147" @default.
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