Section: User Commands (1)
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spfrqpeel - calculate time constant for spike frequency curve
first looks at the injected current waveform, to determine the
range of samples to be analysed.
It then backs off the end point (when current is turned off) by 0.2 ms,
to avoid spikes that are artifacts of the current being switched off.
It then skips the specified number of seconds from the start of the
injected current, and calculates the time constant for the frequency curve
of the spikes in the remaining range.
Output will be in this form:
"Filename", Start, End, Spikes, Current, Slope, Intercept, r, Tau
where the time constant Tau is output in ms, as are the start and end,
and the current is output in the units for which the waveform was calibrated.
It runs the
program on a copy of each specified
so the changes it makes during analysis
(copying or differentiating waveforms, setting waveform parameters)
will not alter any of your run files or their parameters.
- -n sec
Specifies the number of seconds to skip from the start of the current burst
(default is 5).
- -c wfnum
Specifies the waveform number for the injected current waveform
(default is 0).
will try to automatically detect a single current burst on this waveform,
using the mean current level as threshold,
or the cycle threshold previously set in the waveform parameters for this
- -s wfnum
Specifies the waveform number for the waveform containing the spikes to be
measured (default is 1).
- -t thresh
Specifies the spike threshold to be used for the waveform above,
given as a differential (default is 500).
option is used, then the spike threshold is given in whatever units the
analysis program uses for displaying this waveform, but the default is stil
- -h hyst
Specifies the spike triggering hysteresis to be used for the waveform above,
given as a second differential, i.e. relative to the threshold.
The default is 0, for no hysteresis.
Specifies that spike triggering will not be on a differential waveform,
and threshold above will be an actual waveform level.
By default, the spike waveform is differentiated to allow triggering on
a waveform with a lot of baseline shift.
- -r start,end
Specifies the start and end time in the
in milliseconds or whatever is selected as the current time units in the
runfile's analysis parameters.
This overrides the range determined by detecting a current burst in
the injected current waveform.
Specifies that an HPGL plot file of the frequency curve should
be generated for each run file.
Specifies that a GIF plot file of the frequency curve should
be generated for each run file.
Specifies that a plot of the frequency curve should be viewed via the
command for each run file.
Specifies that an ASCII text file of the times and frequencies should
be generated for each run file,
as comma-separated values (a
The times (X values) are first on each line, followed by frequencies (Y values).
Specifies that a frame file be generated for each runfile,
representing the frequency curve as mV,
for further analysis by the
This frame file will have the same name as the runfile, with the name
appended to it.
Causes the program to output a summary of command usage and options.
- spfrqpeel -s 2 -c 1 FF1740521
Simple case using mostly defaults.
The FF1740521 in the command line is
the runfile analysed, and the spike and current waveform numbers are given
explicitly as 2 and 1 respectively.
- spfrqpeel -r 30,557 -t 400 FF1327174 FF1327215
Two run files are analysed with a specified range and the differential
spike threshold is set at 400.
- spfrqpeel -n 0 -c 1 -s 0 -t -27 -h -15 -d -r 65000,70000 -p -g -v -a 090929-013
The run file 090929-013 will be analysed in the range of
65 to 70 seconds (specified in ms), which the plot of the frequency curve
being shown on screen, as well as saved in HPGL, GIF and CSV formats.
Almost all options are specified explicitly.
Differentiation is turned off, and the spike threshold is set to a level
of -27 mV, with a hysteresis level 15 mV below that.
- SEE ALSO
This document was created by
using the manual pages.
Time: 19:13:03 GMT, May 23, 2018
Copyright © G. R. Detillieux,
Spinal Cord Research Centre,
The University of Manitoba.