Simple cumulative timing question

[David McFarlane]

Please do the following exercise:  Start with a new program.  Put the 
following three E-Objects in a Procedure:

- TextDisplay1:  "A", Duration = 1000, Data Logging = Time Audit
- InLine1:  Sleep 1000
- TextDisplay2:  "B", Duration = 1000, Data Logging = Time Audit, 
Timing Mode = Cumulative

Run this and observe the outcome.  How long does the "A" appear on 
the screen?  How long does the "B" appear?  Look at the results in 
the .edat file.  How long were the OnsetDelays?  How does all that 
compare with the prescribed durations of the stimuli and Sleep?  What 
would happen if you changed the prescribed durations?  Test your 
ideas by running again with different durations for the stimuli & 
Sleep.  What do you conclude about what appears on the screen during 
the OnsetDelay of a stimulus object using Cumulative timing 
mode?  Does it seem that the screen simply keeps showing whatever it 
already showed during this time?

-- David McFarlane


At 11/9/2012 06:37 PM Friday, FrankBank wrote:
>Thanks for your response, I think I'm getting the idea now.  One 
>last question though: if the onset delay lasts several refresh 
>cycles, what do the pixels on a CRT monitor display during this time?

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