Presentation of multiple images during one soundfile

[David McFarlane]

Ieva,

Not clear what part gives you trouble here.  But you can present a 
sequence of images during sound playback merely be setting Stop After 
to "No" on your sound objects, and setting Duration to 0 or 
whatever.  Then the sound will continue to play while your program 
goes on to present images.

And if it were me, I might create one sound file that repeats the 
"loopfile" as many times as needed, rather than relying on E-Prime's 
"Loop" functioning.  Or maybe I am missing something there?

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster )

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At 1/13/2014 09:46 AM Monday, Ieva Zeromskaite wrote:
>I would appreciate very much if anybody could help me with the 
>issues I have with my experiment.
>I looked up similar topics in previous threads but could not find an 
>answer I need. Several people who are good at E-prime have not been 
>able to solve the issue I have, so I thought I'd ask here.
>
>The main issue is that I need to present a series of images while 
>one soundfile is playing continuously.
>I have 2 conditions : 1) the in-synchrony condition when images are 
>presented on the beat of soundfile 2) the out-of-synchrony condition 
>when images are presented off-beat
>I have 2 soundfiles - one lasts 2 seconds, and the other - 12 
>seconds. In terms of sound, I need the first 2 sec file to play once 
>at the start of the block, and the second one (12secs) to be played 
>in a loop straight after the first one. The 'loopfile' consists of 4 
>measures, and each measure (3s) has 4 beats at 0, 750ms, 1500ms and 
>2250ms. The fourth beat is a 'silent' beat, and in the -in-sync 
>condition the image should appear on that fourth silent beat.
>
>In out-of-sync condition, the first image should appear at the very 
>start of the second soundfile (the loopfile) and the next ones 
>should appear in every 3 seconds. In in-sync condition, the first 
>image should appear 250ms after the loopfile starts, and again, the 
>other images - every 3 seconds. Images are presented for 250ms 
>followed by 2750ms of fixation cross.
>
>So visually, what happens is:
>IN-SYNC: 1.beginning file (2s) 2.loopfile (12seconds and repeats 
>itself) 3. the images (changes every 3 seconds) start 250ms after 
>the start of loopfile, and the loopfile keeps playing until all the 
>images are shown.
>OUT-OF-SYNC: 1.beginning file (2s). 2. loopfile starts at the same 
>time as picture presentation (changes every 3 seconds), the loopfile 
>keeps playing, same as in the in-sync condition.
>Participants give their responses (to a question 'have you seen this 
>face before?' after that brief presentation of every face for 
>250ms). This experiment will test if the working memory is enhanced 
>when face images are presented in-synchrony with the musical beat.
>
>This is my last-resort help call, if anybody could help me with 
>this, I'd be eternally grateful:)
>
>Thank you in advance!
>
>Ieva

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