p153fig04.32 The double filter network embodies simple, complex, and hypercomplex (or endstopped complex) cells.  It feeds into a network of bipole cells that can complete boundaries when it properly interacts with the double filter.<BR>|| Double filter and grouping network.  Cells : simple -> complex -> hypercomplex (endstopping) -> bipole<TABLE border="1"><TR><TD><B>Grouping network</td><TD>bipole cells</td></tr><TR><TD><B>Double filter</td><TD>hypercomplex cells<BR>endstopping<BR>complex cells<BR>simple cells</td></tr></table>