FW: Staircase procedure in E-prime

[Paul Gr]

Hi Rachel,

You might take a look at the so called Inspection Time test (IT-test), which 
I developed some time ago. In this test two vertical lines of different 
length are draw very briefly. The shorter line is masked after a variable 
delay by making both lines equal in length.  Participants are instructed to 
choose the longest. The masking delay is increased or decreased in steps of 
50 milliseconds by applying a staircase procedure. I don’t have the details 
of the algorithm available right now, but it is a bit more complex than just 
increasing or decreasing according to the latest response accuracy. You can 
download it from http://www.psy.vu.nl/download/menu/
The version on this web-site was developed to test children, so we added 
some fancy feedback (a growing stack of bubbling fishes.)

cheers,
Paul




>From: "Rachel Mitchell" <r.l.c.mitchell at reading.ac.uk>
>To: "Eprime mailing list" <eprime at mail.talkbank.org>
>Subject: FW: Staircase procedure in E-prime
>Date: Tue, 8 Nov 2005 13:18:24 -0000
>
>  Hi everbody.
>
>A colleague of mine wishes to programme a staircase procedure for some
>vision/psychophysical studies, and is interested in the possibility of 
>using
>E-prime for this.
>Specifically, he wants to create an experiment using a staircase procedure
>to determine a threshold by establishing the temporal threshold for a
>temporal-order judgement task (in which participants simply report which of
>2 visual stimuli appear first) using multiple staircases.
>
>I wondered if any of you might have experience with using E-prime in this
>way.
>Does anyone have any comments or advice?
>Perhaps even an example of these kind of procedures already set up using
>E-prime?
>
>Many thanks
>Rachel Mitchell
>
>
>-----------------------------------------------------------------------
>Dr Rachel L. C. Mitchell
>Lecturer in Cognitive Psychology, University of Reading.
>Honorary Research Fellow, Institute of Psychiatry.
>Research Psychologist, Berkshire Healthcare NHS Trust.
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