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Related Concept Videos

Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological states or needs.
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Stages of Sleep01:22

Stages of Sleep

Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...

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Updated: May 27, 2026

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
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Getting drowsy? Alert/nonalert transitions and visual thalamocortical network dynamics.

Yulia Bereshpolova1, Carl R Stoelzel, Jun Zhuang

  • 1Department of Psychology, University of Connecticut, Storrs, Connecticut 06269, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 2, 2011
PubMed
Summary

Brain state shifts significantly alter thalamic drive but not the firing rates of most cortical neurons. Some inhibitory interneurons paradoxically increase firing in the nonalert state.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Understanding how brain states influence neural activity is crucial for deciphering neural coding.
  • Spontaneous shifts between alert and nonalert states are common and can affect signal processing.

Purpose of the Study:

  • To investigate the impact of spontaneous EEG state transitions on neuronal firing patterns in the rabbit visual cortex.
  • To examine how changes in thalamic input during state shifts affect different cortical neuron types.

Main Methods:

  • Recorded spontaneous neuronal activity in rabbit visual cortex (layers 4 and 5) and dorsal lateral geniculate nucleus (LGNd).
  • Analyzed neuronal firing rates and bursting activity during transitions from alert to nonalert EEG states.
  • Examined putative spiny neurons, fast-spike interneurons, and corticotectal neurons.

Main Results:

  • LGNd neurons showed reduced firing and increased bursting in the nonalert state.
  • Layer 4 spiny neurons maintained stable firing rates despite reduced thalamic input.
  • Layer 4 fast-spike interneurons paradoxically increased firing rates in the nonalert state.
  • Layer 5 corticotectal neurons showed state-independent firing rates but increased bursting.

Conclusions:

  • Cortical spiny neuron firing rates are remarkably conserved across alert and nonalert states.
  • Local inhibitory circuits, particularly fast-spike interneurons, exhibit complex state-dependent modulation.
  • These findings highlight the resilience of cortical processing to changes in sensory drive and brain state.