  The dynamical magnetic correlations in \tbti\, have been investigated using
polarized inelastic neutron scattering. Dispersive excitations are observed,
emerging from pinch points in reciprocal space and characterized by an
anisotropic spectral weight. Anomalies in the crystal field and phonon
excitation spectrum at Brillouin zone centers are also reported. These findings
suggest that Coulomb phases, although they present a disordered ground state
with dipolar correlations, allow the propagation of collective excitations.
They also point out a strong spin-lattice coupling, which likely drives
effective interactions between the $4f$ quadrupolar moments.
