![background image](http://html1.mh-extra.com/html/neuropace/pdms-4340/pdms-4340_user-programming-manual_1676339063.webp)
Tablet Instructions
59
RNS
®
System Programming Manual
Rhythmic Activity Detector
The Rhythmic Activity detector provides highly specific and early detection of rhythmic activity within a
defined bandwidth. It acts like a frequency filter and can therefore be used to detect activity within
specific frequency bands (theta, alpha, beta, and gamma). To understand how the Rhythmic Activity
detector works refer to
Figure 40 Rhythmic Activity detector example
The Rhythmic Activity detector analyzes the ECoG to determine when a signal is present within a
specified bandwidth that meets specified amplitude and duration requirements. Four configurable
parameters define the Rhythmic Activity detector operation: the
M
INIMUM
F
REQUENCY
and
M
AXIMUM
F
REQUENCY
that define the bandpass, the
A
MPLITUDE
,
and the
D
URATION
. Detection occurs when a
signal within the bandwidth exceeds the
A
MPLITUDE
for the minimum
D
URATION
. As
D
URATION
is
increased, the detector becomes less sensitive because it will take longer for a signal at a given
frequency to be detected. As
D
URATION
is decreased, the detector becomes more sensitive because
it will take less time for a signal at a given frequency to be detected. As
A
MPLITUDE
is increased, the
detector becomes less sensitive because lower amplitude signals will be rejected. As
A
MPLITUDE
is
decreased, the detector becomes more sensitive because lower amplitude signals will be accepted.
Summary of Contents for PDMS 4340
Page 119: ......