  The behaviour of massive and massless test particles around asymptotically
flat and spherically symmetric, charged black holes in the context of
generalized dilaton-axion gravity in four dimensions is studied. All the
possible motions are investigated by calculating and plotting the corresponding
effective potential for the massless and massive particles as well. Further,
the motion of massive (charged or uncharged) test particles in the
gravitational field of charged black holes in generalized dilaton-axion gravity
for the cases of static and non-static equilibrium is investigated by applying
the Hamilton-Jacobi approach.
