Directional motion sensitivity under transparent motion conditions

F.A.J. Verstraten, R.E. Fredericksen, R.J.A. Wezel, van, J.C. Boulton, W.A. Grind, van de

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We measured directional sensitivity to a foreground pattern while an orthogonally directed background pattern was present under transparent motion conditions. For both foreground and background pattern, the speed was varied between 0.5 and 28 deg sec-1. A multi-step paradigm was employed which results in a better estimation of the suppressive or facilitatory effects than previously applied single-step methods (e.g. measuring Dmax or Dmin). Moreover, our method gives insight into the interactions for a wide range of speeds and not just the extreme motion thresholds (the D-values). We found that high background speeds have an inhibitory effect on the detection of a range of high foreground speeds and low background speeds have an inhibitory effect on a range of low foreground speeds. Intermediate background pattern speeds inhibit the detection of both low and high foreground pattern speeds and do so in a systematic manner.
Original languageEnglish
Pages (from-to)2333-2336
JournalVision Research
Issue number15
Publication statusPublished - 1996


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