The contribution of single-pion photoproduction channels to the spin response of the nucleon, i.e. \ the asymmetry of photoabsorption cross sections with respect to parallel and antiparallel spins of photon and nucleon, is calculated over the region of the  \Delta (1232)-resonance adopting an effective Lagrangian model for the reaction amplitude. Furthermore, the contribution from separate pion photoproduction channels to the Gerasimov--Drell--Hearn integral is explicitly evaluated by integration up to a photon lab-energy of 550 MeV. In addition, the double polarization E asymmetry for the individual pion photoproduction channels is predicted. A quite satisfactory agreement with recent experimental data from the GDH Collaboration is obtained.

PACS numbers: 25.20.Lj, 13.60.Le, 11.55.Hx