we are doing an EEG experiment using PsychPy (1.84.2) and BioSemi/Actiview Software. The computers are using Windows 7 and are connected via parallel port.
We defined event triggers (e.g. positive (1), neutral (2), negative (3) items or block triggers (101-109)) in PsychoPy which are supposed to be sent to the BioSemi/Actiview Software. Some triggers work perfectly, others are not send at all or more often than programmed in PsychoPy. Some triggers are received by BioSemi/Actiview Software which haven’t been defined and therefore shouldn’t be sent at all. We can’t figure out any system by which the triggers are sent or not.
Triggers are sent without any problems using presentation in an other experiment. So we don’t believe it is due to any hardware problems. Also, we checked the triggers in PsychoPy itself and don’t see any problem there, either.
We’d be grateful for any suggestions about what we can try… Right now we are completely clueless.
Also, we’re beginners in programming so bear with us… (we had help from an experienced programmer while creating the experiment in PsychoPy, though).