Synchrony vs. Time

For each spike, this graph shows the distance from this spike to the closest spike (timestamp) in the reference event.

This analysis is useful in identifying the moments in time when several neurons are in sync with the reference neuron. To do this, you need to select Inverted Distance. Then, high values will indicate spikes that are close to each other. Also, it is useful to specify that the graphs are shown in 1 column (in Num. Columns in Properties panel).

The red arrow in the picture below shows a moment in time where several neurons have almost-synchronous spikes with the reference.

Parameters

Parameter	Description
XMin	Time axis minimum in seconds.
XMax	Time axis maximum in seconds
Reference	Reference event.
Distance	An option to draw linear or inverted distance

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

For each spike that occurred at time t[i], this graph shows the distance from this spike to the closest spike (timestamp) in the reference event:

dist = min(abs(t[i] - ref[j])),

where ref[j] is a timestamp of the reference event

If Distance is Linear, the vertical line is drawn

from point (t[i], 0.) to point (t[i], dist).

If Distance is Inverted, the vertical line is drawn

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