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Tablet Instructions
60
RNS
®
System Programming Manual
Spike Activity Detector
The Spike Activity detector functions in a manner very similar to the Rhythmic Activity detector, but it
is optimized for the faster transients that comprise spikes. To understand how the Spike Activity
detector works refer to
Figure 41 Spike Activity detector example
The Spike 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 Spike Activity detector operation: the
M
INIMUM
F
REQUENCY
and
M
AXIMUM
F
REQUENCY
, the
A
MPLITUDE
,
and the
D
URATION
. The
M
INIMUM
F
REQUENCY
defines the slowest spiking
rate that can be detected. The
M
AXIMUM
F
REQUENCY
defines the upper passband for the detector.
Because the signal frequency content of the fast transient portions of spikes are generally much
higher than the spike rate, the
M
AXIMUM
F
REQUENCY
usually needs to be set much higher than the
spike rate. Detection will occur when spikes meeting the frequency requirements also exceed the
A
MPLITUDE
for the
D
URATION
. As
D
URATION
is increased, the detector becomes less sensitive
because it will take longer for detection to occur. As
D
URATION
is decreased, the detector becomes
more sensitive because it will take less time for a detection to occur.
Summary of Contents for PDMS 4340
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