  We consider the possibility of a control field opening up multiple pathways
and thereby leading to new interference and coherence effects. We illustrate
the idea by considering the $J=1/2\leftrightarrow J=1/2$ transition. As a
result of the additional pathways, we show the possibilities of nonzero
refractive index without absorption and gain without inversion. We explain
these results in terms of the coherence produced by the opening of an extra
pathway.
