Direction repulsion in motion transparency

Hiris, Eric; Blake, Randolph

doi:10.1017/s0952523800007227

Cited by 85 publications

(86 citation statements)

References 36 publications

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“…Or et al (2010) found a similar repulsion effect with conflict angles higher than 30° when observers were required to judge the perceived orientation of moving GPs. The repulsion effects reported are similar to those present in motion and orientation domain (Marshak & Sekuler, 1979;Mather & Moulden, 1980;Burke & Wenderoth, 1993;Qian & Geesaman, 1995;Hiris & Blake, 1996;Kim & Wilson, 1996;Rauber & Treue, 1998;Wishart et al, 1998;Benton & Curran, 2003;Chen et al, 2005).…”

Section: Discussionsupporting

confidence: 70%

The interaction between orientation and motion signals in moving oriented Glass patterns

et al. 2017

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Previous psychophysical evidence suggests that motion and orientation processing systems interact asymmetrically in the human visual system, with orientation information having a stronger influence on the perceived motion direction than vice-versa. To investigate the mechanisms underlying this motion-form interaction we used moving and oriented Glass patterns (GPs), which consist of randomly distributed dot pairs (dipoles) that induce the percept of an oriented texture. In Experiment 1 we varied the angle between dipole orientation and motion direction (conflict angle). In separate sessions participants either judged the orientation or motion direction of the GP. In addition, the spatiotemporal characteristics of dipole motion were manipulated as a way to limit (Experiment 1) or favour (Experiment 2) the availability of orientation signals from motion (motion streaks). The results of Experiment 1 showed that apparent GP motion direction is attracted towards dipole orientation, and apparent GP orientation is repulsed from GP motion. The results of Experiment 2 showed stronger repulsion effects when judging the GP orientation, but stronger motion streaks from the GP motion can dominate over the signals provided by conflicting dipole orientation. These results are consistent with the proposal that two separate mechanisms contribute to our perception of stimuli which contain conflicting orientation and motion information: (i) perceived GP motion is mediated by spatial motion-direction sensors, in which signals from motion sensors are combined with excitatory input from orientationtuned sensors tuned to orientations parallel to the axis of GP motion, (ii) perceived GP orientation is mediated by orientation-tuned sensors which mutually inhibit each other. The two mechanisms are revealed by the different effects of conflict angle and dipole lifetime on perceived orientation and motion direction.

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Section: Discussionsupporting

confidence: 70%

The interaction between orientation and motion signals in moving oriented Glass patterns

et al. 2017

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“…To assess deviations from unimodality in the marginal histograms, we computed Hartigan's dip-statistic combining of prior information about the distribution of the direction of illumination (more likely from above than below) and geometry of certain shapes (faces are convex, not concave). When subjects are presented with two transparently moving stimuli, such as two superimposed populations of moving dots, judgements in the relative direction of motion are overestimated, a phenomenon that has been termed motion repulsion [1]. The smaller the angular difference between the two dot populations, the bigger this repulsive effect.…”

Section: Discussionmentioning

confidence: 99%

“…Other types of repulsive effects can also be observed in judgements between two transparently moving stimuli [1]. While these effects have been framed in terms of inhibitory interactions between directionally selective neurons as a low-level, sensory phenomenon (see [1][2][3][4]), it has also been suggested they could result from higher-level cognitive effects [5].…”

Section: Introductionmentioning

confidence: 99%

Do perceptual biases emerge early or late in visual processing? Decision-biases in motion perception

Zamboni¹,

Ledgeway²,

McGraw³

et al. 2016

Proc. R. Soc. B.

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Visual perception is strongly influenced by contextual information. A good example is reference repulsion, where subjective reports about the direction of motion of a stimulus are significantly biased by the presence of an explicit reference. These perceptual biases could arise early, during sensory encoding, or alternatively, they may reflect decision-related processes occurring relatively late in the task sequence. To separate these two competing possibilities, we asked (human) subjects to perform a fine motion-discrimination task and then estimate the direction of motion in the presence or absence of an oriented reference line. When subjects performed the discrimination task with the reference, but subsequently estimated motion direction in its absence, direction estimates were unbiased. However, when subjects viewed the same stimuli but performed the estimation task only, with the orientation of the reference line jittered on every trial, the directions estimated by subjects were biased and yoked to the orientation of the shifted reference line. These results show that judgements made relative to a reference are subject to late, decision-related biases. A model in which information about motion is integrated with that of an explicit reference cue, resulting in a late, decision-related re-weighting of the sensory representation, can account for these results.

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“…One example where this has not been found is in direction repulsion. Hiris and Blake (1996) reported that repulsion between different directions of motion occurred regardless of whether the two motion signals were presented with the same or different disparities. They concluded that the process responsible for direction repulsion occurs prior to selectivity for binocular disparity.…”

Section: Discussionmentioning

confidence: 99%

Does Binocular Disparity Facilitate the Detection of Transparent Motion?

Hibbard

Bradshaw

1999

Perception

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Abstract. Recent physiological studies have established that cortical cells that are tuned for the direction of motion may also exhibit tuning for binocular disparity. This tuning does not appear to provide any advantage in discriminating the direction of global motion in random-dot kinematograms. Here we investigated the possibility that this tuning may be important in the perception of transparent motion. Random-dot kinematograms were presented which contained coherent motion in a single direction or in two opposing directions. A greater proportion of signal dots was required for the detection of transparent motion than of motion in a single direction. This difference vanished when the two opposite directions of motion were presented with different disparities. These results suggest that the direction of global motion can be computed separately for surfaces which are clearly segregated in depth.

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Direction repulsion in motion transparency

Cited by 85 publications

References 36 publications

The interaction between orientation and motion signals in moving oriented Glass patterns

The interaction between orientation and motion signals in moving oriented Glass patterns

Do perceptual biases emerge early or late in visual processing? Decision-biases in motion perception

Does Binocular Disparity Facilitate the Detection of Transparent Motion?

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