In this study, we present a systematic investigation of the emission spectra of excitonic complexes confined in QDs when an external magnetic field is applied in a direction perpendicular to the optical wave vector Voigt configuration. The effective g factors of an electron and a hole in individual QDs are obtained on the basis of a consistent analysis of the Zeeman splittings in many QDs. Our results reveal a large uniformity of the electron g factors but a broad variation in hole g factors when analyzing QDs emitting at nearly the same energy. By comparing the polarized emission spectra from the neutral and charged excitons in the same QD, we evidence a significant modification of the carrier g factors that we attribute to Coulomb correlations within the few-particle excitonic complexes. We use pyramidal In0.1Ga0.9As/Al0.3Ga0.7As QDs that allow us to observe simultaneously the positively and the negatively charged excitons in the same photoluminescence