The effect of the intramolecular coupling on the resonances associated to the Four-wave mixing signal is studied in the present contribution. The transition and permanent dipole moments are critical quantities for this analysis of the local macroscopic polarization in the adiabatic representation when the rotating wave approximation is not considered. New characteristics of the resonance, emerging as a consequence of the vibronic coupling, are studied here in the framework of a local homogeneous-linewidth third-order perturbation model. (C) 2000 Published by Elsevier Science B.V.