publication venue for Extending Levelt's Propositions to perceptual multistability involving interocular grouping 2017 Flash-lag chimeras: The role of perceived alignment in the composite face effect 2006 Serial visual search from a parallel model 2005 Senescent changes in scotopic contrast sensitivity 1999 EVIDENCE FOR A COMMON BATHO-INTERMEDIATE IN THE BLEACHING OF RHODOPSIN AND ISORHODOPSIN 1984 Critical flicker frequency as a function of viewing distance, stimulus size and luminance 1970