Overlapping events

[mich]

Hi Helen,

 

Have you tried setting up multiple buffers in E-Prime and just playing them
using inline statements? I don’t know if you can actually mix stimuli like
that (that is, if two buffers can be played simultaneously), but it’s worth
a try since the audio in an inline statement only waits as in your event
example below when you actually ask E-Prime to wait for x ms. Consider:

 

[soundbuff is a 100 ms tone of 1000 hz]

Soundbuff.play()

Debug.print “started at ” + clock.read

 

Output:

[Some_sound]

Started at 12 

[Some_sound continues]

 

Vs

Soundbuff.play()

Sleep 100

Debug.print “started at ” + clock.read

 

Output

[Some_sound]

Started at 112 

[Some_sound continues]

 

I don’t actually have E-Prime here, and neither do i have the code of
previous experiments that illustrate it better, but there are a number of
suggestions I should make in order for you to use sound via E-Prime scripts
instead of objects:

-          Try multiple sound buffers

-          Make them as long as the maximum duration

-          Load them when the trial begins but when nothing crucial is
happening (before the onset of a fixation cross, for example)

-          Play them only after you have loaded them

 

Hope that helps, and let me know if you want specific scripts. Again, I’m
not sure what exactly you want, nor whether this will help, but write to me
at mspape at fsw.leidenuniv.nl if you need help. 

 

Cheers,

 

Michiel Spapé

Cognitive Psychology Unit

Leiden University

Netherlands

 

 

 

 

 

From: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] On Behalf
Of Helen Day
Sent: vrijdag 27 juli 2007 15:40
To: EPRIME at mail.talkbank.org
Subject: Overlapping events

 

A trickier question this time, 

 

Because I want the subjects to be able to answer halfway through a stimulus
and not before this halfway point but as soon as they can after, I'm trying
to figure out how to overlap 3 events: a text event saying "Listen" that
lasts for 7 seconds, an audio file that starts playing one second after the
text event is presented, and a slide event that promts them for the answer
that begins just as the "Listen" event ends (that is, exactly 6 seconds into
the audio event). Because the audio event is transparent, I can simply set
the "Listen" text to last for one second and then layer the audio over it.
However, I can't see any way to get the slide prompt to begin while the
audio is still playing, since even if the event is transparent it won't
start until the event before it is finished. Shortening the duration of the
audio event obviously isn't an option because I need all 10 seconds of the
audio to be heard. Has anyone successfully layered stimuli like this before?


Helen

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