Understanding Spontaneous Activity in the Rat Olfactory Bulb
Author Information
Author(s): Josif Stakic, Jessica M. Suchanek, Geoffrey P. Ziegler, Edwin R. Griff
Primary Institution: University of Cincinnati
Hypothesis
Spontaneous activity in olfactory receptor neurons drives much of the spontaneous activity in mitral and tufted cells via excitatory synapses.
Conclusion
Spontaneous activity in neurons of the main olfactory bulb is not primarily driven by activity in olfactory receptor neurons.
Supporting Evidence
- Lidocaine application significantly decreased the amplitude of the olfactory nerve evoked field potential.
- The spontaneous activity of bulbar neurons did not change significantly when conduction in the olfactory nerve was blocked.
- 67% of the recorded units showed spontaneous activity synchronized with respiration.
Takeaway
The study found that the background noise in the brain's smell center doesn't mainly come from smell receptors, but rather from the brain cells themselves.
Methodology
Single units were recorded in vivo from the main olfactory bulb of rats before and after applying lidocaine to the olfactory nerve.
Limitations
The study may not account for all factors influencing spontaneous activity in the olfactory bulb.
Participant Demographics
Adult male Sprague-Dawley rats weighing between 313 and 457 g.
Statistical Information
P-Value
1.07
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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