The ordinal number of the currently running block.
This value increments each time a block is run.
The following displays the value of currentblocknumber in a text stimulus:
<text sometext>
/ items= ("currentblocknumber = <% expt.currentblocknumber %>")
</text>
The following displays the value of currentblocknumber in an instruction page:
<page somepage>
currentblocknumber = <% expt.currentblocknumber %>
</page>