Several flickering tasks run simultaneously

[Michiel Spape]

Oh, wait, simultaneous tasks, you say?
I think there are a few ways of handling this... 
How about you make one slide with your four targets. These are four text "sub objects". Each target has a colour: white (as in, off, since the background is white), or black. See first how you can make them black or white (it's the background colour thing). Then, set each to [Target1Colour], [Target2Colour], [Target3Colour] and [Target4Colour] instead. The slide has a duration of slightly below your maximum refresh rate (i.e. 15 ms if your monitor runs at 60 Hz), and onset sync is on.
Make a list, sequential selection, 1 procedure, and set Exit after to 1 sec (i.e., it repeats for one second). Drag the slide you just made to the one procedure.
Add 4 procedures to the list: Target1Colour, Target2Colour, Target3Colour, Target4Colour. Think of the list as one second, and add levels accordingly: if your monitor runs at 60 Hz, there should be at least 60 levels. Find out, at each level, which of the targets is black. For instance, your second target, flickering at 10 Hz, should be black at the first level (time = 0 ms), 7th level (time = 100 ms), 13th level (time = 200 ms) and so on, but white at level 2-6, and so on.

Well, voila, there you go, it should now flicker. Of course, nothing is randomised, but it should work, and I think you might be able to take it from there. Also, no code yet.
Best,
Michiel

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology
www.cognitology.eu


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of pati-confidence
Sent: 06 July 2011 06:17
To: E-Prime
Subject: Several flickering tasks run simultaneously

I want to build a BCI system, which presents four targets on LCD
screen, with flickering frequencies of 12Hz, 10Hz, 8.6Hz and 7.5Hz.
respectively.

And the four targets are flickering simultaneously.

Can E-prime achieve the goal?

Any tips will be appreciate.  Thank you.

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