attys-ep

Visually evoked potential app for Attys for Windows/Linux

attys-ep performs averaging over repetitive stimuli: visually evoked potentials and P300.

Both the raw data with the trigger and the averaged EP can be saved. Both formats use tab separated values which can be imported by virtually any program, for example python, MATLAB or excel.

Installation

Linux

Linux Ubuntu packages for Ubuntu LTS

Add these two repositories...

sudo add-apt-repository ppa:berndporr/attys
sudo add-apt-repository ppa:berndporr/dsp

...and then select attys-ep in your favourite package manager. This will then install also the other required packages.

Compilation from source

You need the following libraries to compile and run the program:

• attys-comm (https://github.com/glasgowneuro/attys-comm): apt-get install attyscomm-dev

• Qt5 / Qwt standard UBUNTU packages: apt-get install qt5-default libqwt-headers libqwt-qt5-dev

• IIR filter library (https://github.com/berndporr/iir1): apt-get install iir1-dev

• Linux: qmake, make

Windows

Installer

Install the MSI file (not signed): https://github.com/glasgowneuro/attys-ep/tree/master/installer/Release

From source

Install:

• attys-comm: https://github.com/glasgowneuro/attys-comm
• Qwt for QT5: https://sourceforge.net/projects/qwt/files/qwt/6.1.3/ (compile it in the VS64bit console)
• IIR filter library: https://github.com/berndporr/iir1

Edit attys-ep.pro and point it to attys-comm, qwt-6.1.3 and the iir library

Run qmake -tp vc and compile the solution with Visual Studio 2022.

Running attys-ep

Just type: attys-ep or ./attys-ep

Data formats

Evoked potental (event triggered averaging)

Every row contains two columns:

time (ms)      evoked potential (volt)

See example_vep.tsv for an example of a visually evoked potential.

Continous recording

Every row contains three columns:

unfiltered channel 1 (volt)      unfiltered channel 2 (volt)      trigger

the sampling rate is 500Hz for the Attys2 and 250Hz for the Attys1.

In the python directory is the script calc_ep.py which calculates the evoked potential from the raw data.

Credits

attys-ep is based in part on the work of the Qwt project (http://qwt.sf.net).