  Spin polarizabilities provide information on the internal structure of
hadrons in the presence of weak external electromagnetic fields, and are
actively studied by Compton scattering experiments. They provide finer detail
than the regular polarizabilities since they require space and time-varying
fields. Using an effective action in the weak field limit, we have identified
methods to isolate each of the physical quantities ($\mu, \alpha, \beta,
\gamma_{E1}, \gamma_{M1}, \gamma_{E2}, \gamma_{M2}$) for spin-1/2 hadrons, both
neutral and charged. We also perform a lattice QCD simulation to investigate
the feasibility of the effective action approach.
