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<div class="moz-cite-prefix">This sounds like a perfect situation
for nested lists: create one List with two rows:<br>
<br>
Row 1: Weight 10, nested list ItemList, dur 100<br>
Row 2: Weight 10, nested list ItemList, dur 1000<br>
<br>
ItemList contains your 20 image filenames (along with whatever
other properties you want to record per item).<br>
This will allow you to avoid duplication as a common item list is
sampled in both duration conditions.<br>
<br>
You can use the same trial procedure for both rows of the List
above, using [dur] to specify how long an image appears.<br>
<br>
best,<br>
David<br>
<br>
On 13/12/2013 12:57, D Burls wrote:<br>
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<div dir="ltr">Hello, I have been struggling with an issue and
would appreciate some feedback. I am sure that this is a very
simple problem, but I cannot figure this one out.
<div><br>
</div>
<div>What is the simplest way to present multiple images that I
want to show for two possible durations (100 or 1000ms)?
Currently I have duration as a nested variable with two
identical lists apart from differing durations (one list for
100ms and one for 1000ms). However, this can lead to the
problem that the same photo can come up twice (from the 100ms
list and also the 1000ms list) - I want each image to occur
only once at one of the durations. Also, the number of images
shown at each duration should ideally match by the end - that
is, 10 images have been shown for 100ms and the remaining 10
images for 1000ms. This process should be random at all
stages.
<div><br>
</div>
<div>Thanks in advance. </div>
</div>
</div>
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<pre class="moz-signature" cols="72">--
David Vinson, PhD
ESRC Research Fellow
Cognitive, Perceptual & Brain Sciences Research Department
University College London
Tel: +44 (0)20 7679 5311 (UCL: internal extension x25311)</pre>
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