The Representation of Nonuniform Motion: Induced Movement

Wade, Nicholas; Swanston, Michael T

doi:10.1068/p160555

Cited by 67 publications

(13 citation statements)

References 52 publications

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“…Furthermore, as exemplified by the model presented here, computing an object-centered reference frame does not necessitate a viewer-centered representation (Sedgwick, 1983;Wade & Swanston, 1987), making it an efficient substitute for the latter.…”

Section: Frames Of Referencementioning

confidence: 99%

“…One required computational step is to represent the various motion paths in an appropriate reference frame. Various ways of defining a reference frame have been proposed, ranging from retinocentric, in which an object is coded relative to the location of the activity it induces on the retina, to geocentric, in which objects are represented independent of the observer's viewpoint (Wade & Swanston, 1987). According to an object-centered reference frame (Bremner, Bryant, & Mareschal, 2005;Wade & Swanston, 1996), objects are perceived relative to other objects.…”

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confidence: 99%

See 1 more Smart Citation

How do object reference frames and motion vector decomposition emerge in laminar cortical circuits?

Grossberg

Léveillé²,

Versace³

2011

Atten Percept Psychophys

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How do spatially disjoint and ambiguous local motion signals in multiple directions generate coherent and unambiguous representations of object motion? Various motion percepts, starting with those of Duncker (Induced motion, 1929(Induced motion, /1938 and Johansson (Configurations in event perception, 1950), obey a rule of vector decomposition, in which global motion appears to be subtracted from the true motion path of localized stimulus components, so that objects and their parts are seen as moving relative to a common reference frame. A neural model predicts how vector decomposition results from multiple-scale and multiple-depth interactions within and between the formand motion-processing streams in V1-V2 and V1-MST, which include form grouping, form-to-motion capture, figure-ground separation, and object motion capture mechanisms. Particular advantages of the model are that these mechanisms solve the aperture problem, group spatially disjoint moving objects via illusory contours, capture object motion direction signals on real and illusory contours, and use interdepth directional inhibition to cause a vector decomposition, whereby the motion directions of a moving frame at a nearer depth suppress those directions at a farther depth, and thereby cause a peak shift in the perceived directions of object parts moving with respect to the frame.Keywords Motion perception . Vector decomposition . Frames of reference . Peak shift . Complementary computing . V2 . MT . MST How do we make sense of the complex motions of multiple interacting objects and their parts? One required computational step is to represent the various motion paths in an appropriate reference frame. Various ways of defining a reference frame have been proposed, ranging from retinocentric, in which an object is coded relative to the location of the activity it induces on the retina, to geocentric, in which objects are represented independent of the observer's viewpoint (Wade & Swanston, 1987). According to an object-centered reference frame (Bremner, Bryant, & Mareschal, 2005;Wade & Swanston, 1996), objects are perceived relative to other objects. For example, on a cloudy night, the moon may appear to be moving in a direction opposite to that of the clouds. In a laboratory setting, this concept is well-illustrated by induced-motion experiments, wherein the motion of one object appears to cause opponent motion in another, otherwise static, object (Duncker, 1929(Duncker, /1938. Frames of referenceFrom a functional perspective, the creation of perceptual relative frames of reference may be one mechanism evolved by the brain to represent the motion of individual objects in a scene. This ability appears especially important when considering that the meaningfulness of the motion of a particular object can often be compromised by the motion of another object. For example, when looking at a person waving a hand from a moving train, the motion components of the hand and the train become mixed together. By representing the motion of the hand rel...

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Section: Frames Of Referencementioning

confidence: 99%

mentioning

confidence: 99%

How do object reference frames and motion vector decomposition emerge in laminar cortical circuits?

Grossberg

Léveillé²,

Versace³

2011

Atten Percept Psychophys

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“…This refers to motion which is experienced when fixating on a stationary point of light in an otherwise completely darkened environment. It was first observed by Alexander von Humboldt in 1799 with respect to the apparent wandering of stars (35) . The key condition for autokinesis to occur is the lack of another visual reference or background, i.e., absolute motion mentioned in the introduction.…”

Section: Induced Motion Autokinesismentioning

confidence: 99%

“…Induced motion is not restricted to linear paths. For instance, a patterned stationary disk can be induced to rotate by the rotation of a surrounding concentric patterned annulus (34)(35) . A number of stimulus variables can be identified that reduce or promote induced motion.…”

Section: Induced Motion Autokinesismentioning

confidence: 99%

Basics of seeing motion

Ehrenstein¹

2003

Arq. Bras. Oftalmol.

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“…Hence, we also call them 1M. However, a number of illusions differing widely in phenomenology and explanation, many of which entail no fixation at all, also fit this definition (for detailed discussion, see Heckmann & Howard, in press;Heckmann & Post, 1988;Reinhardt-Rutland, 1988;Wade & Swanston, 1987).…”

mentioning

confidence: 99%