We’re currenly using this program, called Presentation (Neurobehavioral Systems), for our research in evented (visual) evoked potentials. Here is a link, if it’s needed http://www.neurobs.com/menu_presentation/menu_features/features_overview
So the program creates a .log file, where stimulation (we’re using pictures of familiar/unfamiliar faces as a stimuli) file name, time of stimulation and other data are included. All stimuli and time, related to stimuli, are unique; and we need, if it’s possible, stimulation file names (named as “code” in log file) and time of stimulation (“time”) to be imported somehow into a Brainstorm. To be precise - to import stimulation and time as an events.
Sincerely,
Vitaly Podlepich
Kirill Nezhdanov
P.S. One stimulation name corresponds to one time period
I could add the support for these .log files as event markers.
You would load them from the Record tab, menu File > Add events from file.
Is this what you need?
If so, can you give me a few more information:
What are the units for the time? are these sample indices?
How do you synchronize the recordings with the .log file? Is the zero in the recordings correspond to the zero in the .log?
Thank you for your efforts, that’s exactly what we need. We’ve recently found the zero point - it’s shifted forth for 10 seconds from time of stimulation (“time”). Now we’re trying to figure out how synchronization works. So we’ll inform you, when we comprehend this ourselves. And time unit is one second times ten to the minus four power (1 × 10−4) .
We realised how synchronization works: only stimulation file name (“code”) and time of stimulation (“time”) are needed to import data from .log file to Brainstorm. We synchronize our recordings and .log files (Presentation) by using com-port. Time unit is still one second times ten to the minus four power and that’s confirmed. Presentation doesn’t know when we start our recording and counts first stimulation as a zero point in time. That’s why time of the first stimulation equals zero point. We will be really appreciative, if it’s possible to set first stimulation time by ourselves.
I added some support for the Presentation .log file with the information you gave me.
Update Brainstorm (menu Help > Update Brainstorm), and you should be able to load the .log files in your recordings from the Record tab (menu File > Add events from file)
To change the time origin of all the events, you can select all the categories and use the menu Events > Add time offset.