Does subthreshold summation occur with end-line illusory contours?
” Perception 30 ECVP Abstract Supplement Does subthreshold summation occur with end-line illusory contours? V Salvano-Pardieu, T Meigen, B Wink [Département de Psychologie, Université de Tours Previous studies have reported subthreshold summation with edge (Kanizsa square) illusory contours (Dresp and Bonnet, 1995 Vision Research 35 1071 – 1078). According to these authors the formation of illusory contours may be mediated by bipole cells. In the present study, we attempted to establish whether the same mechanism can account for end-line illusory contours. Eight participants detected targets in three conditions: (a) targets superimposed on an illusory contour in an Ehrenstein figure, (b) targets located between two dots (should not produce an illusory contour and consequently no subthreshold summation), (c) targets presented alone (control). Straight and curved targets were used to ensure that the target superimposed the illusory contour. Targets were presented for an unlimited time or
