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Published on: January 6, 2011
Thalamic bursting in rats during different awake behavioral states
E E Fanselow1, K Sameshima, L A Baccala
1Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA. efanse@neuro.duke.edu
Summary
Thalamic bursting, previously linked to sleep, actively occurs during wakeful whisker twitching. This bursting primes sensory pathways for improved signal detection during this specific behavior.
Area of Science:
- Neuroscience
- Sensory Processing
- Thalamocortical Dynamics
Background:
- Thalamic neurons exhibit tonic and bursting firing modes.
- Bursting was historically associated with non-information-relaying states like sleep.
- Recent evidence suggests bursting also occurs during wakefulness, potentially impacting sensory processing.
Purpose of the Study:
- To investigate the role of thalamic bursting during different behavioral states in awake rats.
- To determine if thalamic bursting influences sensory processing during whisker movements.
- To elucidate the direction of neural influence between the thalamus and somatosensory cortex during specific behaviors.
Main Methods:
- Chronic electrode implantation in the ventroposterior medial thalamus (VPM) and primary somatosensory cortex (SI) of awake rats.
- Recording neural activity during quiet immobility, exploratory whisking, and whisker twitching behaviors.
- Utilizing partial directed coherence to analyze neural communication directionality.
Main Results:
- Thalamic bursting significantly increased during whisker twitching, preceding and accompanying the movements.
- Neurons were more responsive to stimuli when preceded by a burst (~120 ms).
- Somatosensory cortex (SI) inactivation abolished whisker twitching, and increased directional coherence from SI to VPM was observed during twitching.
Conclusions:
- Whisker twitching behavior is associated with a specific pattern of thalamic bursting.
- A descending signal from SI likely triggers VPM bursting, enhancing the thalamocortical loop for sensory detection.
- This mechanism primes the sensory system for improved signal processing during active behaviors like whisker twitching.
