              RUNNING THE TRITONIA TUTORIAL SIMULATION

  (Don't forget to move the cursor into this window and use the mouse
   buttons  or b/f buttons to scroll through this text.)


  THE CONTROL BUTTONS
  -------------------
  The control panel at the lower left of the screen contains buttons which
  control the starting and stopping of the simulation.  If you are eager to
  get going, click the left mouse button on the box labeled "STEP" to start
  the simulation while you are reading the help messages.

  The various buttons are:

  HELP - brings up the help menu.

  RESET - resets the simulation to time step 0 and clears the graphs (unless
          in overlay mode).

  STOP - temporarily stops the simulation.  You may then change parameters
         and click on "STEP" to continue, or "RESET" and "STEP" to start
         over.

  QUIT - exits the simulation.

  Reset Deflts - This restarts the simulation with the default values of the
           various parameters.  Use this if you have changed a lot of things
	   and don't remember what the initial values were.

  Overlay - toggles overlay mode.  When in overlay mode, RESET followed by
            STEP causes the next plot to be plotted over the previous plot.

  Spike Plot - toggles the display of a detailed plot of the spikes produced
         by the three cells.

  STEP - in addition to initiating the simulation, this also functions as a
         "dialog box" for setting the number of simulation steps which are
         performed each time.  To change the numeric field of a dialog box,
         move the cursor to the right of the place where you wish to make the
         changes and click the left button.  This will cause the "^" symbol
         to move to the new location.  Then use the "Delete" key to back up
         over anything you wish to change, and type in the changes.  To cause
         the changes to be entered, you must then hit "Return" while the
         cursor is in the numeric field, or click the left mouse button in
         the label field at the left.

  dt - is a dialog box used for setting the simulation time step.  The
       default value of 0.5 milliseconds was chosen as a compromise between
       accuracy and execution speed.  You can speed up the operation of the
       simulation by choosing a larger value if you just want to get a rough
       idea of the effect of changing various neuron parameters.  When you
       are ready for serious work, change it back to the original value.

  Spike Plot - toggles the display of a graph showing the spike output of
       all three cells.

  INJECTION CURRENT
  -----------------

  This set of three dialog boxes may be used to set the magnitude of the
  injection current applied to the cells.  Don't forget to hit "Return"
  after modifying the contents of a dialog box.

  CELL PARAMETERS
  ---------------
  The "Cell Parameters" buttons call up menus with buttons for the soma and
  the various channels for each cell.  These can be used to call up submenus
  with dialog boxes for viewing or changing the soma or channel parameters.
  The channel names indicate the cells which give input to them.  For
  example, the dsi channel "vsiK" is a potassium channel which receives
  input from the vsi neuron, and dsi channel "dsiNa2" is one of the two
  sodium channels to which the dsi neuron self-connects.  Changing the
  weight for a given channel to zero gives a convenient way to see the
  effect of disabling the channel.  Each of the menus has a "DONE" button to
  click on in order to implement the changes and make the menu disappear.

  GRAPHS
  ------
  The three sets of graphs display the membrane potential and channel
  conductances for each of the three neurons.  In order to keep the
  conductance display readable, the conductances for the channels which are
  self-connected to the same neuron are not shown.  The spike output for
  each cell is also displayed above the plot of the membrane potential.  As
  the scale used is rather small, and it is useful to be able to compare the
  output of the three cells with each other, there is an additional plot
  which can be called up with the "Spike Plot" toggle.  Using various
  choices of parameters, this plot may be compared with the experimental
  results shown in Figure 6.1A of the Getting chapter.  These results may be
  viewed with the "Some Results of Experiments" help menu selection.

  The scales of the graphs can be changed by clicking on the 'scale' button
  associated with the graph, changing the values in the appropriate dialogs
  and pressing the 'DONE' button.  For example, you may wish to increase the
  time scale (xmax) if you click on "STEP" more than once without resetting,
  or you may wish to view a more limited range of data in order to increase
  the resolution.  Note that the existing data will be replotted whenever the
  scale is changed.

----------------------------------------------------------------------------
