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Jack_23

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Posts: 31
Reply with quote  #1 
In ml2, viewing distance is 57cm.
When fixation point is set as square, 1 deg. Then, in the subject screen, the width of the fixation point is 1cm, which is all right.
However, when fixation point is set as circle, 1 deg. Then, in the subject screen, neither the radius or the diameter of the fixation point is not 1cm. Indeed, the diameter is larger that 2cm, maybe 2.3cm. Is there problem here in ml2?
Thank you.
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Jaewon

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Posts: 648
Reply with quote  #2 
It is just a historical reason. The original ML drew circles with an anti-aliasing technique and made them a little bigger than the given sizes. ML2 uses the same method so that they look identical in both versions.

There are a couple of things I did change in ML2 though.

- The original ML used diameter to set the size of circles, although the online manual says it should be radius. In ML2, the sizes of all circular objects (fixation point, circles, fixation window) are in radius.

- The background of circles is transparent in ML2.

If you don't like the circle size, open make_circle.m and modify the first line as you want.


If you use ML2's new trialholder and draw a circle with the CircleGraphic adapter, that is another story. The CircleGraphic adapter doesn't use the anti-aliasing technique and sets the size as [x_width y_width]. If you put x larger than y (or y larger than x), you can draw an oval. The attached is the task files showing this difference.

 
Attached Files
zip shapes.zip (1.04 KB, 4 views)

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Jack_23

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Reply with quote  #3 
Thank you, Jaewon.
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