The tilt illusion: Repulsion and attraction effects in the oblique meridian

Brian O'Toole*, Peter Wenderoth

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    76 Citations (Scopus)


    It is commonly believed that the same neural mechanism underlies the tilt illusion and the tilt aftereffect. Recently, it has been demonstrated that tilt aftereffects induced on oblique stimuli are similar, in magnitude and direction, to those induced on stimuli which are vertical or horizontal. If the mechanisms of the illusion and aftereffect are the same, then illusions induced on oblique stimuli should also be similar to those induced on vertical or horizontal stimuli. The six experiments reported here confirmed this prediction by suggesting that both repulsion (direct) and attraction (indirect) tilt illusions occur in the oblique meridian. The data are considered in relation to both psychophysical (normalisation) and neural (lateral inhibition) theories of orientation illusions and aftereffects.

    Original languageEnglish
    Pages (from-to)367-374
    Number of pages8
    JournalVision Research
    Issue number3
    Publication statusPublished - 1977


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