Persistent State
   - Using a LIF model, it's easy to build a state that is
       persistent.
 
   - Take several neurons as the state.  I used 5, but now use 10.
 
   - Give them large internal connections. 
 
   - Activate them all simultaneously.
 
   - They'll then reactivate themselves.
 
   - That's what I call a binary Cell Assembly.
 
   - With 10, I make 2 inhibitory.  When the CA starts to fire too fast,
       the inhibitory neurons fire, and slow it down.
 
   - If you use a fatiguing model, you can have two sets of neurons that
       activate each other.
 
   - This is not the way the brain does it, but it works for programming.