Atomic beam laser spectroscopy was used to measure the isotope shifts (IS) and hyperfine structures of all stable titanium isotopes in eight Ti I spectral lines. Six of the lines investigated cover all allowed transitions between the lower 3d²4s² a ³P and the upper 3d³4p y ³D^o terms; two of them are between the 3d²4s² a ³P_1,2 and 3d²4s4p z ³P₂^o levels. J-dependences of the IS in the a ³P and y ³D^o terms were established. The contributions of the field and mass shifts to the J-dependence were separated using model-independent data on muonic atom IS and electronic scattering experiments. Evidence for mass shift domination of the J-dependence was provided.