.. _WalnutBrain:

================
**Walnut Brain**
================

.. _Prying_Brains_Apart:

Prying Brains Apart
-------------------

Cortical surfaces can obscure structures within the cortex such as
tracts or surface renderings of subcortical regions. To improve
visualization, you can render the surfaces transparent, e.g. :ref:`o
<LC_o>`, but you still can't select through a transparent surface. One
solution is to pry the hemispheres apart. For this to work, you will
need to have both hemisphere loaded into SUMA. You can try the
following, assuming you have the :ref:`MNI_N27` surfaces installed::

   suma -spec MNI_N27 &
   
.. figure:: media/suma_mni_n27.jpg
   :align: center
   :figwidth: 70%
   :name: media/suma_mni_n27.jpg
   
   :ref:`walnut<media/suma_mni_n27.jpg>`
..

Then with both surfaces in view, :ref:`drag while pressing button
1<Control+Button_1-Motion>` to pry open the two hemispheres.

.. figure:: media/suma_mni_n27_pry1.jpg
   :align: center
   :figwidth: 70%
   :name: media/suma_mni_n27_pry1.jpg
   
   :ref:`peanut<media/suma_mni_n27_pry1.jpg>`
   
..

.. figure:: media/suma_mni_n27_pry2.jpg
   :align: center
   :figwidth: 70%
   :name: media/suma_mni_n27_pry2.jpg
   
   :ref:`cashew nut<media/suma_mni_n27_pry2.jpg>`
   
..

More details are found under the interactive help link for :ref:`this
button combination<Control+Button_1-Motion>`. You can :ref:`undo the
prying <Control+Button_1-DoubleClick>` with
Control+Button_1-DoubleClick or :ref:`change the axis about which it
is done with F10<F10>`.
    
.. figure:: media/suma_mni_n27_pry3.jpg
   :align: center
   :figwidth: 70%
   :name: media/suma_mni_n27_pry3.jpg
   
   :ref:`macadamia nut<media/suma_mni_n27_pry3.jpg>`
   
..

For more exciting prying action, such as what is shown below, follow
instructions in scripts
:ref:`Do_09_VISdti_SUMA_visual_ex2.tcsh<Do_09_VISdti_SUMA_visual_ex2.tcsh>`
and
:ref:`Do_09_VISdti_SUMA_visual_ex3.tcsh<Do_09_VISdti_SUMA_visual_ex3.tcsh>`