Spike2 Scripts


Coherence of two waveforms (03/00)

Coherence of two waveforms


The coherence of two waveforms is the measure of their similarity in frequency content. Coherence is a function of frequency and ranges from 0 for totally incoherent waveforms to 1.0. This script generates the coherence and provides a menu in which the two channels to be used and the number of frequencies in the result are set. Up to 2048 frequencies may be calculated.

The principles and operation of the script are fully described in a Word document file that is enclosed with the script.

Find peaks in a power spectrum (01/04)

Find peaks in a power spectrum


This script identifies peaks in a power spectrum stored in a Spike2 result view.

The highest peak and up to 9 other peaks are marked with cursors and a table of up to 50 peak frequency and power values is written to the log view.

This script requires Spike2 version 4.00 or higher.

Gated power spectrum analysis (05/09)

Gated power spectrum analysis


This script allows the user to generate a 'gated' power spectrum where the sections of data to include in the result are defined by a TextMark channel. The script also gives the option of overlapping the FFT blocks within each time range. A suitable example data file, Demo.smr, is included in the Data folder of your Spike2 directory.

This script requires Spike2 version 6.14 or higher.

System for User Definable Spectrum Analysis (04/97)

System for User Definable Spectrum Analysis


This is the first of two scripts for looking at the power of frequencies in user definable frequency bands.

The user is asked to specify an analysis region, this region is then split up into a number of epochs. Each epoch is analysed in turn and the power of frequencies within each band in each epoch for each channel are dumped to a data file.


This second script for doing spectral analysis in user definable frequency bands has a slightly different approach than SUDSA1. This script is more applicable to users who have lots of short epochs. There are several different analyses which can be performed and in each case the results may be dumped to a text file. The analysis modes available are:

  • Dominant frequency
  • Power of dominant frequency
  • Total power of frequencies in bands
  • Log power of dominant frequency
  • Log total power of frequencies in bands
  • Root mean square amplitude
  • Cross correlation

Some of these scripts have come from users rather than the CED team. If you have a script that you would like to offer to fellow users via this page, please tell Simon Gray. We provide some scripts for Signal too.

These scripts are stored as WinZip files, myscript.zip, except where they are shown as spike\scripts\myscript.s2s. Those latter files were installed with Spike2 and spike stands for the directory in which you installed Spike2. See the summaries by clicking on the description in the side menu. Then you can down-load them by clicking on the filename.


Mains ‘hum’ is often complex and composed of odd harmonics of the mains frequency, making it very difficult to remove or suppress using simple high pass or notch filters. HumRemoveExpress.s2s is a Spike2 version 7 script that you can use offline to strip out much of this residual mains interference, making your data much more presentable and easier to analyse. This video tutorial shows how to use the script to remove mains hum.

  • Alpha MED Sciences
  • Alpha Omega Engineering
  • Axon Instruments
  • Binary data
  • Bionic/Cyberkinetics
  • Biopac
  • CED SON (Macintosh)
  • CONSAM (D. Colquhuon)
  • DATAQ Instruments (Codas)
  • DataWave
  • Data Sciences International
  • Delsys Files
  • European Data Format(+)
  • Grass-Telefactor (PolyView)
  • HLR Data Format
  • Heka Data Format
  • Multi Channel System (Mc_Rack)
  • MindSet (16/24) data Files
  • MindWare data files
  • Motion Labs Systems Files .c3d
  • NeuroScan
  • Neuralynx
  • Plexon
  • RC Electronics
  • Text files
  • TMS International
  • Tucker-Davis Technologies
  • WAV (Microsoft)
  • WaveMetrics Igor Pro (PC/Mac)
  • Xltek Neuroworks
Cambridge Electronic Design Limited

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CED, through this site, does two things that relate to privacy. We would like to explain them.

Emails from down-loads

We offer free down-loads of many files on our site, from test programs to complete install files for updated versions of major packages like Spike2 and Signal.

When customers wish to take a down-load of a major package, we ask a few questions, including their name, email address, the serial number of the software for which they seek an upgrade and whether they would like an automatic email whenever we update the product. This information is emailed back to CED when they access the final down-load screen. Within this email, your browser transmits the type and version of browser you are using, and the screen resolution you are running.

The reasons why we take and keep this information are that it is useful for our software development team to know who has taken the latest versions, and it is useful for our web site development team to know which browsers people are using to view our site, and what resolution they have their screens set to.


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