Difference: DocsSectionsExampleSpellerPart4 (3 vs. 4)

Revision 409 Jan 2012 - Main.MarjoleinVanDerWaal

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Example 2: Visual speller

Part 4

<- Go back to Part 3 - Continue with Part 5 ->

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In previous parts of the experiment, stimulus presentation timing was not accurate. Epochs occurred later than specified and the time between stimuli was not constant throughout a sequence. In this part of the example, we will improve these timing issues by using a loop function for stimulus presentation.
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In previous parts of the experiment, stimulus presentation timing was not accurate. Epochs occurred later than specified and the time between stimuli was not constant throughout a sequence. In this part of the example, we will improve these timing issues by using a simple loop function for stimulus presentation.
  The loop function runSequence replaces most actions of the stimulus presentation plug-in. The new flowchart of the plug-in looks like this:
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This loop function should make sure that the time between to stimuli is always 200 ms, during which period a row or column is flashed for 100 ms and the non-highlighted grid is shown for the next 100 ms. Matlab's tic, toc and pause functions are used for stimulus timing.
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This loop function should make sure that the time between two stimuli is always 200 ms, during which period a row or column is flashed for 100 ms and the non-highlighted grid is shown for the next 100 ms. Matlab's tic, toc and pause functions are used for stimulus timing.
 

Evaluation

 
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