Instant Frequency

The instant frequency display shows the instantaneous frequency of the spike train (at the end of each interspike interval, the inverted interspike interval is drawn as a vertical line or as a point).

Parameters

Parameter	Description
XMin	Time axis minimum in seconds.
XMax	Time axis maximum in seconds.
Graph Style	An option to draw vertical lines or points.

Summary of Numerical Results

The following information is available in the Summary of Numerical Results

Column	Description
Variable	Variable name.
YMin	Y axis minimum.
YMax	Y axis maximum.
Spikes	The number of spikes used in calculation
Mean Freq.	Mean firing rate.

Algorithm

The instant frequency display shows the instantaneous frequency of the spike train.

If vertical lines option is selected, or each spike that occurred at time t[i] it draws a vertical line

from point (t[i], 0.) to point (t[i], 1/(t[i] - t[i-1])),

where t[i-1] is the time of the preceding spike.

In other words, at the end of each interspike interval, the inverted interspike interval is drawn as a vertical line.

If graph style draw points option is selected, or each spike that occurred at time t[i] it draws a circle

at (t[i], 1/(t[i] - t[i-1])),

where t[i-1] is the time of the preceding spike.