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The Journal of Neurophysiology Vol. 85 No. 4 April 2001, pp. 1661-1672
Copyright ©2001 by the American Physiological Society
Laboratoire de Neurophysiologie, Département de Physiologie, Faculté de Médecine, Université Laval, Quebec, Quebec G1K 7P4, Canada
Collins, Dawn R.,
J. Guillaume Pelletier, and
Denis Paré.
Slow and Fast (Gamma) Neuronal Oscillations in the Perirhinal
Cortex and Lateral Amygdala. J. Neurophysiol. 85: 1661-1672, 2001. Most lesion studies emphasize the
distinct contributions of the amygdala and perirhinal cortex to memory.
Yet, the presence of strong reciprocal excitatory projections between
these two structures suggests that they are functionally coupled. To
gain some insight into this issue, the present study examined whether the close anatomical ties existing between perirhinal and lateral amygdala (LA) neurons are expressed in their spontaneous activity. To
this end, multiple simultaneous recordings of single unit discharges and local field potentials were performed in the LA and perirhinal cortex in ketamine-xylazine anesthetized cats. The perirhinal cortex
and LA exhibited a similar pattern of spontaneous activity. Recordings
at both sites were dominated by a slow focal oscillation at 1 Hz onto
which was superimposed a faster rhythm (
30 Hz) whose amplitude
fluctuated cyclically. Computing crosscorrelograms between focal waves
recorded simultaneously in the perirhinal cortex and LA revealed a
close relationship between their spontaneous activity. Even when
recording sites were separated by as much as 8 mm, the slow focal
oscillation remained highly correlated (r 
0.7). In contrast, the correlation between fast oscillations was usually lower
(r 0.3). Perievent histograms of neuronal
discharges revealed that the firing probability of most LA and
perirhinal neurons increased during the depth-negative component of the
slow oscillation. In addition, respectively, 47 and 64% of LA and
perirhinal neurons exhibited a significant modulation of firing
probability in relation to the fast oscillations. Finally,
crosscorrelating unit discharges simultaneously recorded in the LA and
perirhinal cortex confirmed the presence of phase-related oscillatory
events in both structures. In summary, our results suggest that the
interconnections existing between the perirhinal cortex and LA can
support the genesis of coherent neuronal activities at various
frequencies. These results imply that cooperative interactions must be
taking place between these structures.
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