ABSTRACT
Local field potential recordings from some of the structures in the olfactory and limbic processing areas – olfactory bulb (OB), prepyriform cortex (PPC), entorhinal cortex (EC), and dentate gyrus (DG) – show three related phenomena. The first is the transmission of the “primary” olfactory bulb burst (60–100 Hz) through these structures. The second is the apparent handshaking burst (at a lower frequency than the primary burst frequency) the primary burst, which occurs at the end of an inhalation. The beta activity described here seems to arise in the EC and is transmitted along the same temporal path as the handshaking burst. This activity may be a mechanism for pushing forward the state change of the dynamical system, while the handshaking burst may provide either a reinforcement or fine tuning to the primary olfactory bulb burst.
