Since I use a lot excelent piece of software called OpenSesame for building my experiments I found a documentation for visual angle conversion from Sebastiaan Mathôt.
For my all EEG paradigms I need to send marks (triggers) via parallel port to EEG to make a stamp when stimuli occurred and which one was that.
In my lab we use Biosemi ActiveTwo 64 active electrode system which can work only with 0-255 range of values. It means you can tag only 255 event types in your recording.
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