[accessibleimage] Re: diagram description

Hi Lisa et al.

My original thoughts on guided exploration were really just a system to ensure that a person discovered all important parts of a diagram. Depending on what people consider the task to be, they will miss finding parts of a diagram. For example, if you instructed someone to find a "shape", they may find a triangle but fail to find the square in which the triangle was contained. This happens because they consider the triangle to be a shape, and therefore they consider that once they've found the triangle they've found the shape and further exploration is pointless. It's worth mentioning that this is a feature of serial presentation, and is therefore not specific to tactile diagrams.

So, there are two means to counter this problem. The first is to precisely inform the user of the shape they are exploring. This will mean that the user will set the point at which they consider the task to be complete to be the point at which they've found all parts of the shape. However, this only really works when the user has pre-existing knowledge of the shape of the object they are exploring, as they need something to compare against when evaluating whether they've found the entire shape. In situations where the person has no pre-existing knowledge, another technique is needed. It's quite a simple technique, and it is to give a person instructions that guide their movement around a diagram. For example, move upwards two centimeters from the current point. As someone else is controlling the areas of the diagram that a person explores, the instructions can be developed to get a person to find all the important parts of a diagram.

This does have an interesting benefit for supplementing the semantic content conveyed by a diagram with semantic content conveyed by another form of presentation, and that is that you know the part of a diagram that a person will be exploring at a given point. Therefore, it makes it relatively easy to synchronise supplementary semantic content, say a description, with a specific point on a diagram.

I would agree that the supplementary semantic content should be derived from the original material, not the tactile diagram. The tactile diagram already conveys semantic content, and therefore simply repeating the semantic content conveyed by the diagram adds nothing to the overall information a person gains. Therefore, deriving descriptions from the original material should add to a person's understanding.

Will
----- Original Message ----- From: "Lisa Yayla" <lisa.yayla@xxxxxxxxxx>
To: <accessibleimage@xxxxxxxxxxxxx>
Sent: Wednesday, March 01, 2006 10:30 AM
Subject: [accessibleimage] Re: diagram description


Hi,
I mean the tactile image.
So the result for one adapted graphic might be two descriptions, a
description for the source material and another description for the
tactile graphic. I say "might be" because I am guessing it would depend
upon the situation.
Also am thinking that this tactile description- guidance would be for the
cases where sound is not involved such as IVEO and TTT, since they have a
helping system here.

The background is that the description often accompaning the tactile
graphic is actually a description of the source material that the tactile
is made from. This is also valuable but still is a description of
something else.

Best,
Lisa


accessibleimage@xxxxxxxxxxxxx skriver: 
Hello,

Before I set out for an explanation that might not be to the point, just a
question of vocabulary: by tactile graphics, do you mean tactile images,
or
just graphs?

Christine
02 358 27 68


-----Original Message-----
From: accessibleimage-bounce@xxxxxxxxxxxxx
[mailto:accessibleimage-bounce@xxxxxxxxxxxxx] On Behalf Of Lisa Yayla
Sent: mercredi 1 mars 2006 10:00
To: accessibleimage@xxxxxxxxxxxxx
Subject: [accessibleimage] diagram description

Hi,
There was an interesting discussion in another list uvip@yahoogroups about
tactile diagrams, guided exploration, description etc. Will Pearson wrote
a very interesting mail and it got me to thinking. Something I have been
thinking about for a while.  And that is description for tactile graphics.
Perhaps some of you have solutions already worked out. It would be nice to
hear about them.

The point about guided exploration was very interesting. Perhaps there
could be levels of description. Simple, detailed, more detailed ?
One could divide the graphic in 4 quadrants upper right, upper left, lower
right and lower left.
First one would give a general description of the whole, then tell what
there is in each quadrant.

So that the description following the tactile would be a description of it
and not of the source material that the tactile is based on.

What do you think?
Best,
Lisa


Lisa Yayla
Huseby Kompetansesenter
Oslo Norway
lisa.yayla@xxxxxxxxxx



Lisa Yayla
Huseby Kompetansesenter
Oslo Norway
lisa.yayla@xxxxxxxxxx





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