Assume the following example of the FN model ( Fitzhugh - Nagumo model = the FN model of neuron activity that we discussed in class ) : = - ( - 0 . 6 ) ( - 1 ) - = 0 . 0 3 ( - 0 . 6 ) Assume that ( 0 ) = 0 . For which initial values of ( 0 ) can you observe an action potential ( " action potential" = " ( ) is increasing at = 0 " ) ?