  It was recently proposed that the fringe visibility in the interference
pattern of a double-slit diffraction experiment with a HeNe laser beam was
reduced as a consequence of the focused attention of participants on the
double-slit that initiated the collapse of the photon wavefunction. A thorough
examination of the reported apparatus and diffraction pattern data is presented
here revealing a number of inconsistencies in the experimental setup. The
hypothesis for wavefunction collapse under the proposed experimental conditions
is found problematic as the use of single photon sources is demanded.
