absurd

Thank you Eduard, That did the trick. I inserted this inline script (I had to change exp.correct_response to exp.get('correct_response'), though). Then I set both Sketchpad 5 and the inline script to run if [response]!=[correct_response] within th…

in [solved] repeat sketchpad until correct response given Comment by absurd April 2015

Hi Eduard, Thank you for providing this example script. My misunderstanding was that I tried to solve the problem by using nested loops. I now tried out your example script and I have some questions. So what happens is the following: I start the …

in [solved] Custom forms: How to activate a 'Next Button' only when a checkbox is chosen Comment by absurd April 2015

Hi, That's simple: instead of the full path in the sampler item you create a partial part with a variable that is fed by the loop. Thus, if you have e.g. /home/myaccount/experiment/sounds/sound1.wav as full path in your sampler item, you turn it i…

in Using audio stimuli for IAT on Open Sesame Comment by absurd April 2015

Hi Josh, Thanks for your help. I tried this, but my experiment nevertheless either just proceeds if the next button is pressed or it just quits (i.e. the break command ends the loop, but the loop does not run again). Here is a minimal working exam…

in [solved] Custom forms: How to activate a 'Next Button' only when a checkbox is chosen Comment by absurd March 2015

Hi Grusha! The + - 4ms thing: Length of triggers are (to my knowledge) always ms accurate (that's why we use the parallel port). It is just that if you define a trigger length shorter than your minimal duration (which is 4ms in our example) it may…

in What is the "duration" in the parallel port trigger? Comment by absurd March 2015

Hi Grusha, (Quote) Yes, but you would need to subtract 4ms of the recorded time. And then the remaining time until the sound end trigger subtracted by the length of your wav file will be the delay (hopefully, i.e. always the same amount of time lon…

in What is the "duration" in the parallel port trigger? Comment by absurd March 2015

If you want to send triggers every 30ms, you have to make sure that all Opensesame items between two triggers add up to 30ms. So, e.g. you want to send only triggers and present nothing, you could use only the parallel port trigger item, set it to 3…

in What is the "duration" in the parallel port trigger? Comment by absurd March 2015

Hi Grusha, A bit general information: The triggers sent to EEG-Amplifiers/Software are transmitted via a parallel port cable. The parallel port cable has a lot of pins/wires in it but only some of them can be freely used (pins 2-9), therefore, we …

in What is the "duration" in the parallel port trigger? Comment by absurd March 2015

Hi Johan, I can only make some guesses: * As regards the XP 32 Desktop, have you looked inside this PC's BIOS? I had a similar problem with an older Dell with LPT on motherboard. In this Dell's BIOS one could choose the so called LPT port mode und…

in Trigger does not work on every computer Comment by absurd February 2015

Hi rip, Well, it is true what we are saying. If you put stimuli within one sequence they are accurately timed (all shorter jitter or delay occurring there is due to your hardware then. These delays occur no matter what presentation software you use…

in [open] Timing Accuracy and Stimuli Onset Times Comment by absurd December 2014

(Quote) That would be nice, indeed, though -- according to my experience with Presentation -- this only works well if you have really a well chosen hardware and, most of all, a huge amount of RAM (at least if you present more than just pictures). I …

in [open] Timing Accuracy and Stimuli Onset Times Comment by absurd December 2014

How did you design your experiment? With a loop item? Then these delays would be explainable, as OS uses a prepare run strategy (see: here). The computer will prepare the whole trial sequence before running it and the additional delay might be the…

in [open] Timing Accuracy and Stimuli Onset Times Comment by absurd December 2014

Hi Teresa, Just a guess: Maybe it is an issue with RAM? How much RAM has your recording PC? The easiest thing would be to try out running the experiment on a different PC (preferably with more RAM) and see if the problem persists. Good luck, Johan…

in [open] problem with recording device Comment by absurd October 2014

Hi Joshua, No, I never had such a problem. I had an issue with ghost triggers, see here. Though your problem sounds similar. By +1 you really mean, e.g., 37 instead of 36? Or does BioPac display binary values? (I have never worked with one). The se…

in [solved] EEG triggers and parallel ports Comment by absurd May 2014

Hi Joshua, Yes, this is possible and that's what I do. You have to look for a card that supports EPP and ECP and complies to IEEE 1284. It should be a bidirectional card as well. And of course you have to look if there's a Win7 driver available. A…

in [solved] EEG triggers and parallel ports Comment by absurd April 2014

Hi Joshua, I use the plugin as well. No, you do not have to put in any additional inline scripts. What operating system do you use? If it is Windows you might have to use another port number. You can look that up under the Windows control panel. …

in [open] Parallel port trigger plugin Comment by absurd April 2014

Hi Sebastiaan and Edwin, I have tested out the minimal trigger length with Sebastiaan's script (thank you very much for providing it!). To make the import parallelppdev work, I had to add the following lines before it: import syssys.path.append('/…