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

[Michiel Sovijarvi-Spape]

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!

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