Questions about miniblocks,stimulus onset asynchrony,and present stimuli after a sound ends

[David McFarlane]

Oh, and for my approach to #3, you will also want 
to pay close attention to the differences between 
Event and Cumulative timing modes -- see Chapter 
3 of the User's Guide, on Critical Timing (I do 
discuss this in my online course, but I still 
insist that everyone study Chapter 3 for the details).

-- dkm


At 3/15/2012 05:56 PM Thursday, David McFarlane wrote:
>Sorry if I'm a bit late to this party, bur for the record...
>
>Michiel already covered answers for #1 & #2, 
>which comes down to using nested Lists -- for 
>more on this do the nested Lists tutorial in 
>Appendix C of the User's Guide that came with 
>E-Prime, and work through Michiel's free 
>E-Primer (available at the STEP web site, 
>step.psy.cmu.edu ); and if that is not enough 
>and you have some money & time to spend, I cover 
>the basics of how to do this sort of thing in 
>the "Task Design Structure" lesson of my online course.
>
>If for #3 you mean ISI instead of SOA, EP can do 
>that very easily too.  For your SoundOut object, 
>set End Sound Action to Terminate, and Duration 
>to some suitably large value (e.g., 
>(infinite)).  Now the SoundOut object will 
>automatically end right at the end of the sound 
>file.  (This, too, is covered in my online 
>course; and remember that the Duration of the 
>object that plays a sound is *not* the same as 
>the duration of the sound file being 
>played).  Following your SoundOut, add any 
>appropriate object to take up the ISI (e.g., 
>TextDisplay, or even a Wait in this case), use 
>an attribute reference for its ISI, and then 
>follow that with your next stimulus, i.e., your ImageDisplay.  Voilà
>
>-----
>David McFarlane
>E-Prime training 
>online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
>Twitter:  @EPrimeMaster (twitter.com/EPrimeMaster)
>
>
>At 3/9/2012 06:51 AM Friday, Michiel Sovijarvi-Spape wrote:
>>Hi,
>>1. Which tutorial? From your questions, it seems to me a clear necessity
>>that one should not READ the tutorial, but go through it, completely. Much
>>like learning any language, "just" reading a dictionary and the rules of
>>grammar do not grant you proficiency; it takes time and work to get a feel
>>for how to use these tools. If you like, you might want to continue your
>>learning by also doing the absolutely free tutorial thing somewhere on my
>>website (www.cognitology.eu) or other websites you can find by searching for
>>"an e-primer". Speaking of grammar: I find it difficult to understand what
>>you are saying - I do not wish to sound nagging, and I understand not
>>everyone is fluent, but your message does not come across as clear as you
>>presumably hoped it would.
>>2. So, you want to divide one condition (SOA) with 3 levels, without
>>replacement, unevenly across 3 blocks. Tutorials probably don't mention
>>"mini-blocks" because it doesn't seem to be a term as such. You can,
>>however, easily do what you want:
>>
>>Step 1: create a trial list with 22 trials (levels, if you like to keep it
>>very transparent). Add your trial-procedure here. No attributes necessary,
>>but, importantly, you add a nested list (by typing in a name under the
>>Nested List column).
>>Step 2: inside the nested list, add an attribute SOA. Add 66 trials. For the
>>first 22 SOAs, add 0, the second 22, 120, and so on. Turn on randomisation.
>>Step 3: within your trial procedure, add the slide or whatever with which
>>you make the SOA. In duration, enter [SOA].
>>Done, now, the 3 values of SOA are randomly (independently) scattered over 3
>>blocks.
>>
>>3. E-Prime does not have a method for detecting the end of sound. It would
>>be best for you to figure out, using some software (like cooledit) to find
>>out exactly, and I mean, exactly at 44100 Hz precision, when audio files
>>end. Even if E-Prime would come with such capabilities, you'd probably not
>>want to trust it. Anyway, I'd suggest naming files with the duration
>>("PRIMESOUND100MS.WAV" for instance). Once you'll already know the length of
>>the sound (the length of the sound is different from the length of the
>>soundFILE), having somebody following directly after it shouldn't be
>>difficult.
>>Best,
>>Michiel
>>
>>
>>
>>-----Original Message-----
>>From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf
>>Of Heng Li
>>Sent: 08 March 2012 06:43
>>To: E-Prime
>>Subject: Questions about miniblocks,stimulus onset asynchrony,and present
>>stimuli after a sound ends
>>
>>1. I read the tutorial but didn't find the solution to dividing trials
>>into miniblocks.I have 66 trials in total and I want to randomly
>>assign them into three blocks each with 22 trials.
>>2. I have three different SOAs, 0ms, 120ms, and 400ms, as an IV. I
>>need randomly insert an SOA (which is accompanied by a blank screen)
>>between the prime and target stimuli.How can I do that within 3
>>miniblocks?Given 66/3=22 but 22/3 is not an integer, I want to divide
>>the SOAs among all trials but not in each miniblock.
>>3. My priming stimulus is a sound and my target stimulus is a
>>picture.For the SOA inserting btw the prime and target,I want it to
>>start immediately after the sound ends.Since the sound stimuli are of
>>different durations,how can I tell E-Prime to detect the end of each
>>priming sound?Thanks a lot!

-- 
You received this message because you are subscribed to the Google Groups "E-Prime" group.
To post to this group, send email to e-prime at googlegroups.com.
To unsubscribe from this group, send email to e-prime+unsubscribe at googlegroups.com.
For more options, visit this group at http://groups.google.com/group/e-prime?hl=en.