In recently introduced schematic lattice gas models for vibrated dry granul
ar media, we study the dynamical response of the system to small perturbati
ons of shaking amplitudes and its relations with the characteristic fluctua
tions. Strong off equilibrium features, as negative responses, appear and a
generalized version of the fluctuation dissipation theorem is introduced.
The relations with thermal glassy systems and the role of Edwards' compacti
vity are discussed.