  We demonstrate how resonant pair scattering of correlated electrons above T_c
can give rise to pseudogap behavior. This resonance in the scattering T-matrix
appears for superconducting interactions of intermediate strength, within the
framework of a simple fermionic model. It is associated with a splitting of the
single peak in the spectral function into a pair of peaks separated by an
energy gap. Our physical picture is contrasted with that derived from other
T-matrix schemes, with superconducting fluctuation effects, and with preformed
pair (boson-fermion) models. Implications for photoemission and tunneling
experiments in the cuprates are discussed.
