[Critical evaluation of the searching technic of the polarization-sensitive neurons of insects]

The demerit of the light stimulator used by the authors was the presence of lenses between the eye and the observed light source. Apart from the image of the aperture diaphragm, the images of some details and reflections were formed. The terminal lens of the stimulator and the eye optics can divide the main and secondary images of the retina. Therefore the reactions of insect neurons to polarized light described previously could be explored also as the responses to flickers in secondary images.