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The Journal of Neuroscience, 3298, 19:RC20:1-4
RAPID COMMUNICATION
Fast Network Oscillations in the Hippocampal CA1 Region of the
Behaving Rat
Jozsef
Csicsvari,
Hajime
Hirase,
András
Czurkó,
Akira
Mamiya, and
György
Buzsáki
Center for Molecular and Behavioral Neuroscience, Rutgers, The
State University of New Jersey, Newark, New Jersey 07102
This study examined intermittent, high-frequency (100-200 Hz)
oscillatory patterns in the CA1 region of the hippocampus in the
absence of theta activity, i.e., during and in between sharp wave (SPW)
bursts. Pyramidal and interneuronal activity was phase-locked not only
to large amplitude (>7 SD from baseline) oscillatory events, which are
present mainly during SPWs, but to smaller amplitude (<4 SD) patterns,
as well. Large-amplitude events were in the 140-200 Hz, "ripple"
frequency range. Lower-amplitude events, however, contained slower,
100-130 Hz ("slow") oscillatory patterns. Fast ripple waves
reversed just below the CA1 pyramidal layer, whereas slow
oscillatory potentials reversed in the stratum radiatum and/or in the
stratum oriens. Parallel CA1-CA3 recordings revealed correlated CA3
field and unit activity to the slow CA1 waves but not to fast ripple
waves. These findings suggest that fast ripples emerge in the CA1
region, whereas slow (100-130 Hz) oscillatory patterns are generated
in the CA3 region and transferred to the CA1 field.
Key words:
sharp waves; ripples; gamma activity; inhibition; EEG; interneurons
Copyright © 0000 Society for Neuroscience 0270-6474/0/$05.00/0
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