Global motion processing is not tuned for binocular disparity.

Paul Barry Hibbard, MF Bradshaw, B DeBruyn

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

An important goal of the visual system is the segmentation of image features into objects and their backgrounds. A primary cue for this is motion: when a region shares the same pattern of motion it is segregated from its surround. Three experiments were carried out to investigate whether the segmentation of image features on the basis of motion information is facilitated by the addition of binocular disparity. Coherence thresholds were measured for the discrimination of the global direction of motion of random dot kinematograms (RDKs) in which the relative disparity of the signal and noise dots was manipulated. When the signal dots were embedded in a three dimensional cloud of noise dots, coherence thresholds were similar to those measured when signal and noise dots were both presented with zero disparity. However, when the signal dots were separated from the noise dots in depth, global motion processing was strongly facilitated. These results were considered in terms of two models, one in which global motion is processed by disparity tuned mechanisms, the other in which the discrimination of the direction of motion is mediated by an attention-based system. It was concluded that global motion processing is not tuned for binocular disparity and that the facilitation of the discrimination of direction provided by binocular disparity in certain circumstances reflects the role of an attention-based system. (C) 1998 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)961-974
Number of pages14
JournalVision Research
Volume39
Publication statusPublished - Mar 1999

Keywords

  • binocular disparity
  • global motion
  • stereopsis
  • depth perception
  • binocular vision
  • TEMPORAL VISUAL AREA
  • TRANSPARENT MOTION
  • OPTIC FLOW
  • MACAQUE MONKEY
  • RHESUS-MONKEY
  • PERCEPTION
  • DEPTH
  • STEREOPSIS
  • INTEGRATION
  • SENSITIVITY

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