Did subject press a button to indicate a solution?
0 = no buttonpress
1 = buttonpress

Buttonpress ~= 0 (FILTER)
0 = Not Selected
1 = Selected

Codings used by the raters
0 = unsolved
1 = real solution
2 = plausible alternative
3 = partial solution
4 = implausible solution

0 = incorrect solution
1 = correct solution

0 = not recalled
1 = recalled