SR box problems with EyeLink
I am currently running an experiment whereby I need to use a SR button box. There is no indication of the brand or model on the box itself; it is a single button box, that connects via USB to the computer. With the srbox plugin, things seem to work (responses are successfully collected). However:
1) I put the srbox plugin at the beginning of my experiment. For some reason, if I just click "run" the experiment, I get a blank display. I can manage to run successfully the experiment only if I click run, and then I immediately press the button of the button box. Only in this way the instructions and the task are shown. Why does this occur?
2) Participants are supposed to provide their response in a visual search by pressing the button box. During the visual search they have to keep fixation, that is, they have to select the stimulus by attending covertly to the display. I check that they are fixating properly while they are doing the visual search. The problem is that if I collect responses with the button box, the fixation check does not work - whereas when I collect the responses by means of normal keypresses on the keyboard, the fixation check works. I was wondering whether calling srbox.start() might somehow interfere with the eyetracker.sample() function. What could be the problem?
Many thanks in advance for your help!