Flickering '+' fixation

[maayan kedar]

Hello,

 

 

I am having hard time to understand how I can create a slide which contains flickering '+' fixation.

I looked up here and sow explanations about crating few items flickering on different time but am not got to create only one!

 

I used the online help and tried this:

 

Slide. Draw

 

Sleep 200

 

Slide. Clear

 

and so on, but no matter how much I repeated these draw and clear it always stop after 3 times!

 

I also tried to create loop but it didn't go well /:

 

 

Another problem is that I need only the fixation to flash and not other items, and to stop when the participant presses the keyboard for correct answer.

 

I whold appreciate very much your help to explain how to put the fixation to flash with or without loop?

 

Thank you very much in advance

 

Maayan

[Paul Groot]

Hi,

Normally I would advise to simply use another list-object for creating a repeating (flickering) slide object. But if timing is critical, and you would only like to redraw/clear a single subobject on the slide, you could go ahead with the for loop. However, keep in mind you have to sync with the refresh rate of the display if you update the screen contents (by using Display.WaitForVerticalBlank). When the loop should be terminated by a keyboard response, you should use the InputMaskManager.IsPending  function and a while loop. The fixation object can be referenced as a subobject of the Slide state (Slide.States('...').Objects('...')) The EBasic manual contains examples for this...

cheers

Paul

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[maayan kedar]

Thanks!

Some how, I got into a problem with the subobject, got an error massage says thet I cant for example fix the duration of a subobject.

Anyway I'll try this direction again

Thanks again

Maayan

בתאריך יום חמישי, 18 באפריל 2013 01:16:12 UTC+3, מאת Paul Groot:

[Paul Groot]

Duration is a property of the (parent) Slide object, not one of its subobjects...

paul

To view this discussion on the web visit https://groups.google.com/d/msg/e-prime/-/JTZiYyhJsXEJ.