Probe Viewer

Annotated Probe Viewer editor
Visualizes the signal from a linear probe as a heatmap (time x channels). Can be configured to show RMS signal, spike rate, or power in different frequency bands.

Plugin Type



Windows, Linux, macOS

Built in?


Key Developers

Josh Siegle, K. Michael Fox, Anjal Doshi

Source Code

Installing and upgrading

The Probe Viewer plugin is not included by default in the Open Ephys GUI. To install, use ctrl-P or ⌘P to access the Plugin Installer, browse to the “Phase Calculator” plugin, and click the “Install” button.

The Plugin Installer also allows you to upgrade to the latest version of this plugin, if it’s already installed.

Plugin configuration

The Probe Viewer visualizer interface (accessed by clicking the “tab” or “window” buttons at the top right of the plugin editor) looks like this:

Annotated Probe Viewer visualizer

To change the subset of channels to be viewed, drag the edges of the bounding box in the channel browser interface on the left-hand side of the visualizer. The currently displayed channels are shown as circular icons in the zoomed-in view to the right.

Render modes

  1. RMS Signal - Color corresponds to the overall amplitude of the signal on each channel (computed as root-mean-squared signal amplitude within each pixel window). The minimum and maximum of the color scale can be adjusted.

  2. Freq. Band Power - Color corresponds to the spectral power at a given center frequency. For example, this can be used to visualize theta-band (8 Hz) power across depth.

  3. Spike Rate - Color corresponds to the number of threshold crossings per unit time within each pixel window. The threshold voltage can be adjusted.