  The question of pseudovector versus pseudoscalar coupling schemes for the
kaon-hyperon-nucleon interaction is re-examined for the reaction $\gamma p\to
K^+ \Lambda$ in several isobaric models. These models typically include Born
terms, $K^*$- and $K_1$-exchange in the t-channel, and a few different
combinations of spin-1/2 baryon resonances in the $s$- and $u$-channels. The
coupling constants are obtained by fitting to a large data set. We find that
both pseudoscalar and pseudovector couplings can allow for a satisfactory
description of the present database. The resulting coupling constants,
$g_{K\Lambda N}$ and $g_{K\Sigma N}$, in the pseudovector coupling scheme are
smaller than those predicted using flavor SU(3) symmetry, but consistent with
the values obtained in a QCD sum rule calculation.
