  We perform a statistical study of the characteristics of galaxies in voids
and void walls in the SDSS and 2dFGRS catalogues. We investigate dependencies
of the distribution of galaxy spectral types and colours as a function of the
relative position to the void centres for different luminosity and local
density ranges. We find a trend towards bluer, star forming galaxies in void
walls beyond the local density dependence. These results indicate that
luminosity and local density do not entirely determine the distribution of
galaxy properties such as colours and spectral types, and point towards a large
scale modulation of star formation. We argue that this effect is due to the
lower accretion and merger history of galaxies arriving at void walls from the
emptier inner void regions.
