MORE ON THE ASSOCIATIVE INTERPRETATION OF THE INDIRECT MCCOLLOUGH EFFECT

Following an induction procedure in which a coloured pattern (e.g. spo kes) is alternated with a complementarily coloured, homogeneous, patte rnless circle, subjects report colour aftereffects on both the pattern presented during induction (i.e. spokes) and on an orthogonal non-ind uced pattern (i.e. concentric circles). The aftereffect reported on th e induced pattern is the McCollough effect (ME), and the aftereffect r eported on the non-induced orthogonal pattern has been labelled the in direct McCollough effect (IME). The results of the present experiments show that the colour aftereffect reported on the non-induced pattern is not indirect but is elicited by elements of the patternless circle that alternated with the patterned stimulus during induction. These da ta provide further support for the associative account of the IME prop osed by Eissenberg, Allan, Siegel, and Petrov (1995).