30Sep
ERP calibration procedure for Mitsar-EEG-BT
26Jan
ERP calibration procedure w/ SmartBCI and SmartSYNC module
Calibration procedure for stimuli presentation delays in the ERP studies using the SmartBCI with SmartSYNC synchronization module.
When studying Event Related Potentials (ERP or EP), auditory and visual stimuli are presented to the patient, and their reaction is recorded on the patient's EEG. There is a delay between the moment the stimulus is launched in the program and the moment the patient perceives it, due to signal delays in the audio and video channels. These delays can be...
07Aug
WinEEG and Psytask setup for ERP
WinEEG and Psytask setup for ERP on Windows 11 machine
For ERP recording it is necessary to connect two desktop computer or laptops with Ethernet cable. However some modern laptops do not have LAN port availalbe. We do recommend to use USB-LAN adapter provided by laptop manufacturer.Workgroup setup
First of all dd both of your computers used for ERP recording in the workgroup with the same name and set them proper names to simplify...
20Mar
What information is in EDF+ annotations?
The EDF+ specification defines additional type of signal, so called "EDF annotations" signal. In EDF+ file exported from WinEEG we have 5 different annotations. EDF specification does not prohibit having several such signals in EDF+ file. Moreover, the Polyman software actually reads EDF+ files with multiple "EDF annotations" signals without any problems. The Polyman simply combines all "EDF annotations" signals into one. You can do it the same way.Labels of the beginning ERP trial with number of trial...
08Nov
Independent components (ICA) of ERPs
These independent components of ERP linearly mixed will comprise the original averaged ERP signal. Each component is an independent piece of the ERP signal, representing a stage in the processing of the perception and then the motor aspects and then the cingulate’s self monitoring of the response. Though inter-related, each piece is a separate stage in the sequential process that creates the complexity of the ERP itself. In WInEEG software we apply Infomax ICA algorithm to decompose original ERP...
04Sep
Subject response (patient button) processing setup for ERP analysis.
If you are using WinEEG+Psytask ERP system, the button response processing is programmed in WinEEG. When you record ERP you should connect patient response button to yellow socket of amplifier. You will see two red channel corresponding to clicking left and right button. To process subject respond channel while computing ERPs go to drop down menu Analysis—Compute ERP. Then you should select Digital 1 for left mouse button or Digital 2 for right button as shown below (arrow 1), after this go to next step (“Define” button, arrow...
28Aug
WinEEG and e-Prime connection
WinEEG and e-Prime should work on different computers. WinEEG works on WindowXP PC but ePrime works on Windows 98 PC!!! We will call WinEEG computer as recording computer and ePrime computer as presenting computer. The main goal of connection is to synchronize the stimuli presentation process and EEG recording. e-Prime can send codes via COM port and WinEEG can catch this codes and recognize them as stimuli onsets. That is why the next steps should be done to setup this connection. 1. Connect recording...
27Aug
What labels are exported to EDF+?
WinEEG can export to EDF+ format such markers as: Labels of the beginning ERP trial with number of trial typePatient response (with button) for GO task So you can see it below in Polyman software 3. Moments of the beginning photo-stimulation flash series of one frequency with digital label of this frequency in Hz and it looks like this: Other parameters (as user’s labels, markers of every photo-flash and so on) are not exported to the EDF+ files. Behavioral responses can be calculated like...
27Aug
ERP dialog window tips
You can control X axis in the right panel as shown on the picture below, choosing the beginning and end of the time interval you want to see on a diagram. Two dashed vertical lines on the ERP plots mean the moments of appearance and disappearance of sound or image stimulus. The structure of a single trial in the task is shown below Pre-stimuli interval and other parameters are defined in Psytask software where you can set or change them. You can measure amplitude...
