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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You can do this if you have all of the
stimuli in the same list (a row for 1, 2, etc.) that’s nested within your
presentation list, and then pick which column is chosen from in the
presentation list (a, b, etc.). You can randomize both lists to get
randomization of the rows and columns, or you could present one or the other
sequentially to get 1,2,3 or a,b,c.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>A STEP script that does this is the one replicating
Lukatela and Turvey’s 1994 priming experiments (either version should
work). It has all of the primes listed in a single list, and then picks the
kind of prime when it randomizes. The subject wouldn’t see a target more
than once, but the type of prime they see with each target is randomized, as
well as the order of the targets.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hope this helps,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Susan</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Susan Campbell</span></font><font color=navy><span style='color:navy'></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Graduate Research Assistant</span></font><font color=navy><span style='color:navy'></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>University</span></font><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'> of Maryland</span></font><font color=navy><span style='color:navy'></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Center for Advanced Study of Language</span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> eprime@mail.talkbank.org [mailto:eprime@mail.talkbank.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>LoCasto, Paul C. Prof.<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, October 31, 2006
10:54 AM<br>
<b><span style='font-weight:bold'>To:</span></b> eprime@mail.talkbank.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> clarification on
counterbalancing question</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello all-</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I see I might have been unclear in my original post- I
apologize. I am aware of being able to create a number of lists- and for each
list counterbalance stimuli manually i.e:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>List 1= 1a, 2b, 3c, 4a, 5b, 6c,</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>List 2= 1b, 2c, 3a, 4b, 5c, 6a</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>List 3= 1c, 2a, 3b, 4c, 5a, 6b</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>and then at the Block level have E-prime choose to present
one of these lists using the counterbalance display option. However, unless I
manufacture each possible list sequence this is really pseudorandom in that
anyone who sees stimulus 1a, will also see stimulus 4a and 5b etc. </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Would someone be so kind as to tell me how I might list my
stimuli in a way that has E-prime *<b><span style='font-weight:bold'>randomly</span></b>*
select whether a Ss sees version ‘a’, ‘b’,
‘c’ of a given stimulus and across the whole experiment would see
an equal number of stimuli across the three conditions (a, b, c) where no
stimulus (e.g. stimulus 1) was seen in more than one version (e.g. 1a *<b><span style='font-weight:bold'>or</span></b>* 1b *<b><span style='font-weight:bold'>or</span></b>*
1c). </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I would really appreciate any insight you can afford.
Thanks.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Paul</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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