Learning-induced oscillatory activities correlated to odour recognition: a network activity
Claire Martin1, Rémi Gervais, Belkacem Messaoudi
1Institut des Sciences Cognitives, UMR 5015 CNRS-Université Lyon I, IFR19, Institut Fédératif des Neurosciences de Lyon, Bron, 69675 France.
The European Journal of Neuroscience
|April 21, 2006
Summary
Functional coupling between olfactory bulb and higher brain structures is crucial for odour recognition. Disrupting this network impairs beta oscillations, suggesting learned olfactory networks drive odour perception.
Area of Science:
- Neuroscience
- Olfactory system research
- Computational neuroscience
Background:
- Beta oscillatory activity in the olfactory system correlates with odour recognition in rats.
- The role of functional coupling between the olfactory bulb (OB) and higher brain structures in this activity is not fully understood.
Purpose of the Study:
- To investigate the role of functional coupling between the OB and higher structures in odour-induced beta oscillations.
- To determine if OB centrifugal afferences are necessary for odour recognition-related beta activity.
Main Methods:
- Unilateral inactivation of the medial olfactory peduncle using lidocaine infusion in trained behaving rats.
- Assessment of odour-induced oscillatory beta responses and spontaneous gamma activity in the OB and piriform cortex (PC).
Main Results:
- Lidocaine infusion reduced odour-induced beta oscillatory responses in both the OB and PC.
- A significant enhancement of spontaneous gamma activity was observed in the OB and PC following inactivation.
Conclusions:
- Odour-induced beta oscillations may be an emergent property of a learned olfactory functional network.
- Functional coupling and centrifugal afferences from higher structures like the PC are essential for normal olfactory processing and odour recognition.
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