Four classes of states are identified for the olfactory system from
EEG traces. (1) Fluctuations are suppressed under
deep anesthesia.
(2) In
waking but unmotivated animals the amplitude is low and the
trace is irregular and unpredictable. (3) Under motivation
the
irregular activity is interrupted by brief oscillatory bursts
following activation of the OB by receptors on inhalation.
(4)
Under several seconds of intense electrical stimulation of the LOT
an epileptic seizure is released. It is intiated after the
failure
of excitatory input transmission as shown by the decreasing
responses at left to the last 5 pulses of the stimulus train. The
seizure spike train then progressively emerges from a relatively
quiet post-stimulus state.
W. J. Freeman
Simulation of Chaotic EEG Patterns with a Dynamic Model of the
Olfactory System
Biological Cybernetics. vol.56, pp.139-150, p.146. 1987.
