Cluster window

As an alternative to template matching, spikes can be sorted by cluster cutting. Values calculated by PCA or user-defined measurements are plotted to a 3D clustering window.

  • View can be rotated in 3 dimensions using mouse or sliders
  • K-means and normal mixtures algorithms for automatic cluster separation
  • Manual cluster separation by placing ellipses
  • View dots from a percentage of the entire time range and step through time to track moving clusters
  • Generate interval histograms based on displayed clusters
  • Show/hide particular clusters
  • Visual identification of clustered spikes occurring within a specified refractory period
  • Density plot option to aid cluster identification
  • Copy values as text (underlying data values and display co-ordinates)
  • Select individual spikes with a mouse click for manual classification

Cluster window

Principal Component Analysis
  • Select principal components to plot on X, Y and Z axes
  • Calculation of components for multiple trace (stereotrode or tetrode) channels based on entire waveform, peak amplitude or ratio of peak to mean amplitudes

User-defined measurements
  • Select measurements for X, Y and Z axes to cluster the data
  • Measure times, amplitudes, slopes and areas
  • Save up to 10 configurations containing different sets of measurements
  • For multiple trace data, measure individual trace or mean of trace measurements

Cluster generation by user-defined measurements

Cambridge Electronic Design Limited

Registered in England: 972132

Registered office:

  • Cambridge Electronic Design Limited,
  • Technical Centre,
  • 139 Cambridge Road,
  • Milton,
  • Cambridge CB24 6AZ

VAT: GB 214 2617 96

Producer Registration number: WEE/BD0050TZ

Terms and Conditions of Sale

For our US customers, we can provide tax form W-8BEN, that identifies us as a UK company.

DUNS: 219151016
NAICS: 423490
Commodity codes
Hardware: 84716070
Software: 85234945

By email:

By post:
  • Cambridge Electronic Design Limited,
  • Technical Centre,
  • 139 Cambridge Road,
  • Milton,
  • Cambridge CB24 6AZ
By telephone:

(Int.+44) (0)1223 420186

From North America (Toll Free):

1 800 345 7794


Privacy policy

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.


When people down-load a major package, we try to write a cookie, a small file in your computer, that records your name, serial number of the software package, and the version you are down-loading. These files have a lifetime of one year.

The reasons for storing this information are firstly that if you ask for another down-load some other time, your details are read from the cookie and are pre-written into the form, to save you looking them up again. The other reason is that next time you access our site, your browser looks through your CED cookies and compares the versions down-loaded with the latest version numbers read from our site. If there is a later version of a product you have already down-loaded, we tell you on the home page screen, so you know that it is worth going to the down-load page again.

None of this information is ever given to anyone outside CED. ×