A value from 0 ot 255 specifying the intensity of the green component of the screen color.
Higher values mean the color has more green.
The following displays the value of screencolorgreen in a text stimulus:
<text sometext>
/ items= ("screencolorgreen = <% block.someblock.screencolorgreen %>")
</text>
The following displays the value of screencolorgreen in an instruction page:
<page somepage>
screencolorgreen = <% block.ablock.screencolorgreen %>
</page>