Biomedical Engineering Reference
In-Depth Information
Figure 6
. Spatiotemporal components of the trajectories of the center of vertical pressure of
the cerebellar (left column) and the control group (right column) are shown. (
A
)
x
-components
(right-left), (
B
) y-components (front-rear), including the standard deviations (shaded areas) of
the trajectories. The arrow within the CS-US window indicates the conditioned response in the
control group. Note that the standard deviation is much higher in the cerebellar patients for
both directions.
cantly larger in the controls (final level in controls = 14.5 3.4%, patients =
68.8 16.9%; (43)). Although less pronounced, a similar result has been found
in a previous study on the classically conditioned lower leg withdrawal reflex
(41). During paired trials the final mean UR amplitude was 48.9 19.3% for the
cerebellar patients, 70.0 5.9% for the group of cerebellar patients showing
extracerebellar symptoms, and 42.8 17.6% for the controls (41).
As mentioned above, the plastic process responsible for decay during US-
alone trials is of a non-associative type and is most likely due to habituation.
During paired trials an additional associative plastic process must be assumed,
