Growing feedback bar

[Moss, Antony Charles]

I'd suggest something similar- if you set the width (or height,
depending on the orientation of your bar) as an attribute, which is
set to an appropriate default value (so the width of the bar would be
something like '[width]:10%'), some simple scripting will then allow
you to update this as participants earn points.  I suspect that this
could be achieved simply by inserting a short script at the end of the
trial procedure which increases the width attribute by a certain
amount if the previous response was correct.

I did something very similar with a slider bar, but instead of varying
the width, I was varying the Y-position of a line to allow
participants to give responses on a semantic differential scale (e.g.
agree-disagree with a statement), hence allowing them to see the
response they were giving.

Tony

_______________________ 
Antony Moss 
Graduate Teaching Assistant 
Department of Psychology 
London South Bank University 
London 
SE1 0AA 
  
Tel:      020 7815 5869 
Fax:     020 7815 5775 
Email:   mossac at lsbu.ac.uk

-----Original Message-----
From: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] On
Behalf Of Michael P. Berner
Sent: 02 August 2007 08:12
To: 'Leisha Wharfield'; 'E-Prime'
Subject: AW: Growing feedback bar

Leisha,

one possible solution might be continually resetting the width of the
SlideImage object (i.e., the bitmap of your bar) via an Attribute
(e.g.,
[BarWidth]) that is incremented in an InLine script whenever the
participant
scores a point. Crucially, the Stretch option of the SlideImage would
have
to be set to Yes. In this way, the bar "grows" with the increments as
the
bitmap is stretched to the newly set width of the SlideImage. One
limitation
of this approach is that you can increment in steps of 1 percent only,
and
I'm not sure whether that would suffice to create the impression of
smooth
growth you're looking for (esp. given the maximum score of 28 points,
which
limits your successive increments for each point to 3 steps; with
increments
of 4 points you will eventually run out of screen space).

best wishes  --  Michael Berner

--------
Department of Psychology
University of Wuerzburg, Germany
http://www.psychologie.uni-wuerzburg.de/i3pages/




-----Ursprüngliche Nachricht-----
Von: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] Im
Auftrag
von Leisha Wharfield
Gesendet: Mittwoch, 1. August 2007 21:52
An: 'E-Prime'
Betreff: Growing feedback bar

Hi, all,

What would be the easiest way to create a bar that grows on the
screen? 
Subjects can earn up to 28 points, so a green progress bar will grow 
every time they earn a point. I have 28 bars of various sizes, but we 
want the bar to appear to grow, so I also have a piece of the bar that

is one-quarter of one point. I want to add it to the top of the bar in

quick succession so that the bar appears to grow. The problem is 
determining the exact place on the screen to place the little bar
piece.

Is there an easier way?

Leisha Wharfield
Decision Research
Eugene, Oregon USA


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