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Related Experiment Videos

Cellular mechanisms underlying activity patterns in the monkey thalamus during visual behavior.

E J Ramcharan1, C L Cox, X J Zhan

  • 1Department of Neurobiology, State University of New York at Stony Brook, Stony Brook, New York 11794, USA.

Journal of Neurophysiology
|October 12, 2000
PubMed
Summary

Burst firing in monkey thalamic relay cells is triggered by low-threshold calcium spikes (LTSs). This firing mode, previously linked to sleep, also occurs during wakefulness, suggesting a role in visual processing.

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Area of Science:

  • Neuroscience
  • Cellular Electrophysiology

Background:

  • Thalamic relay cells exhibit tonic and burst firing modes.
  • Burst firing in thalamic cells has been described in various mammals.
  • The cellular mechanisms underlying burst firing in primates were not fully elucidated.

Purpose of the Study:

  • To investigate the cellular basis of burst firing in monkey thalamic relay cells.
  • To determine if low-threshold calcium spikes (LTSs) evoke burst firing in primates.
  • To explore the occurrence of burst firing during different behavioral states in monkeys.

Main Methods:

  • In vitro electrophysiological recordings from monkey thalamic relay cells.
  • Activation of voltage-dependent, low-threshold calcium spikes (LTSs).
  • Analysis of firing patterns during alert wakefulness in behaving monkeys.

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Main Results:

  • Low-threshold calcium spikes (LTSs) were confirmed to evoke burst firing in monkey thalamic relay cells.
  • The amplitude of LTSs determined the number of action potentials per burst (1-8).
  • Burst firing was observed in thalamic relay cells during alert wakefulness, challenging previous assumptions.

Conclusions:

  • Burst firing in monkey thalamic relay cells is mediated by LTS activation, similar to other mammals.
  • The presence of burst firing during wakefulness suggests its functional relevance in primates.
  • LTS-mediated burst firing likely plays a crucial role in visual information relay during alert states.