Hi there - two thoughts:
- I’m not quite sure if this also applies to your setup, but as per this advice, you should beware of USB-parallel-port connections. Am I correct that, based on your explanation, your stimulus computer is outputting via parallel port into the eego EEG software, which has USB input? If so, then @habboud’s warning in that post about timing precision may apply.
- If the EEG system is never seeing a value, are you sure that any of the if statements ever evaluate to true? Is
imagesdefinitely the variable name that holds the image string? Just something to check.