Asymmetry and symmetry in eccentric line interaction

E.G.J. Beerens, H. Bouma

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    In the previous paper (Beerens and Bouma, this issue) we have shown that in eccentric vision an adverse interaction between line-segments can be found which operates over the same distance as interaction between eccentrically presented letter stimuli. It is known that the interaction between letter stimuli in eccentric vision is asymmetrical around the test letters; the interaction is stronger if the interaction letter is on the peripheral side of the test letter rather than on the foveal side (Mackworth, 1965; Bouma, 1970). In this paper our aim is to show that the interaction between line stimuli is asymmetrical around the test stimulus with the same bias as found with letter stimuli, and that it seems possible to describe this asymmetry empirically by assuming the interaction to be symmetrical around the interaction stimulus. Furthermore, we have found indications that the form of the asymmetrical interaction area can be derived from the same assumption.
    Original languageEnglish
    Pages (from-to)120-123
    Number of pages4
    JournalIPO Annual Progress Report
    Publication statusPublished - 1970


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