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Home » Publications » Statistical properties of pauses of the high-frequency discharge neurons in the external segment of the globus pallidus.

Statistical properties of pauses of the high-frequency discharge neurons in the external segment of the globus pallidus.

The neurons of many basal ganglia nuclei, including the external and internal globus pallidus (GPe and GPi, respectively) and the substantia nigra pars reticulata (SNr) are characterized by their high-frequency (50-100 spikes/s) tonic discharge (HFD). However, the high firing rate of GPe neurons is interrupted by long pauses. We studied the extracellularly recorded spiking activity of 212 well-isolated HFD GPe and 52 GPi/SNr neurons from five monkeys during different states of behavioral activity. An algorithm that maximizes the surprise function was used to detect pauses and pauser cells (“pausers”). Only 6% of the GPi/SNr neurons versus as many as 56% of the GPe neurons were classified as pausers. The GPe average pause duration equals 0.62 s. The interpause intervals follow a Poissonian distribution with a frequency of 13 pauses/minute. No linear relationship was found between pause parameters (duration or frequency) and the firing rate of the cell. Pauses were preceded by various changes in firing rate but not dominantly by a decrease. The average amplitude and duration of the spike waveform was modulated only after the pause but not before it. Pauses of pairs of cells that were recorded simultaneously were not correlated. The probability of GPe cells to pause spontaneously was extremely variable among monkeys (30-90%) and inversely related to the degree of the monkey’s motor activity. These findings suggest that spontaneous GPe pauses are related to low-arousal periods and are generated by a process that is independent of the discharge properties of the cells.

Authors: Elias, S, Joshua M, Goldberg JA, Heimer G, Arkadir D, Morris G, Bergman H.

Year of publication: 2007

Journal: Journal of Neuroscience, 27 (10) 2525-2538

Link to publication:

https://doi.org/10.1523/JNEUROSCI.4156-06.2007

Labs:

Hagai Bergman

Mati Joshua

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