The scale factor to apply to the size of the stimulus.
<clock> <picture> <shape> <text> <video>
The default is 1.0 scale. Values smaller than 1.0 reduce the size of the stimulus while values larger than 1.0 increase the size.
The following displays the scale of a text stimulus:
<text sometext>
/ items = ("scale = <% text.foo.scale %>")
</text>
The following scales a picture stimulus to 1.5 times it size:
<picture targets>
/ items = targetitems
/onprepare = [picture.targets.scale = 1.5;]
</picture>