Annual Report 2006

Fig. 8
EEG recording in the absence of
eyelid movement obtained from a
piglet while lying at rest
Relative power of each activity
(delta, theta, alpha and beta) is
shown at the bottom.
Fig. 9
EEG recording in the presence of
eyelid movement obtained from a
piglet while lying at rest Other
explanations are as described in
Fig. 8.
(Saito et al. , 2005)
data suggest the protein-permeable scaffold of
collagen vitrigel membrane is useful for the
reconstruction of crosstalk models between two
different cells.
Electroencephalogram (EEG)
changes with eyelid movements
in piglets
It is known that the amplitude and rhythm
of the EEG is largely altered in response to
opening and closing eyes. In this study, a
wireless recording system was applied to
examine EEG activity with or without opening
eyes in unrestrained, male Landrace piglets.
Electrodes and telemetry devices were implanted
under halothane anesthesia. Recordings were
performed while lying at rest, following
recovery from the surgical operation. In the
absence of eyelid movement, slow waves with
large amplitude appeared in the EEG. The
power of the delta (1-3.9 Hz) and theta (4-7.9 Hz)
activities were larger than that of the alpha (8-
12.9 Hz) and beta (14.1-25 Hz) (Fig. 8). While
eyelid movement was present, faster waves
with small amplitude were recorded in the EEG
trace. With the eyelid movement, the power of
the alpha and beta activities was stronger than
that of the delta and theta (Fig. 9). According to
the power spectral analysis of the EEG, the
delta and theta activities, which appeared in the
absence of eyelid movement, were replaced
with faster alpha and beta activity once eyelid
movement appeared. These findings strongly
suggest arousal in the piglets while lying at
rest.