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A theory of moving form perception: Synergy between masking, perceptual grouping, and motion computation in retinotopic and non-retinotopic representations.

Oğmen H - Adv Cogn Psychol (2008)

Bottom Line: Based on this duration of visible persistence, we would expect moving objects to appear highly blurred.However, in human vision, objects in motion typically appear relatively sharp and clear.We suggest that clarity of form in dynamic viewing is achieved by a synergy between masking, perceptual grouping, and motion computation across retinotopic and non-retinotopic representations.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical & Computer Engineering, Center for Neuro-Engineering & Cognitive Science, University of Houston, Houston, TX 77204-4005 USA.

ABSTRACT
Because object and self-motion are ubiquitous in natural viewing conditions, understanding how the human visual system achieves a relatively clear perception for moving objects is a fundamental problem in visual perception. Several studies have shown that the visible persistence of a briefly presented stationary stimulus is approximately 120 ms under normal viewing conditions. Based on this duration of visible persistence, we would expect moving objects to appear highly blurred. However, in human vision, objects in motion typically appear relatively sharp and clear. We suggest that clarity of form in dynamic viewing is achieved by a synergy between masking, perceptual grouping, and motion computation across retinotopic and non-retinotopic representations. We also argue that dissociations observed in masking are essential to create and maintain this synergy.

No MeSH data available.


Related in: MedlinePlus

A schematic description of the RECOD model. The open and filled synaptic						symbols depict excitatory and inhibitory connections, respectively. To avoid						clutter, only a small part of the networks and connections are shown. The						inter-channel inhibitory connection from the transient channel onto the						sus-tained channel represents the interchannel						"transient-on-sustained" inhibition.
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Figure 3: A schematic description of the RECOD model. The open and filled synaptic symbols depict excitatory and inhibitory connections, respectively. To avoid clutter, only a small part of the networks and connections are shown. The inter-channel inhibitory connection from the transient channel onto the sus-tained channel represents the interchannel "transient-on-sustained" inhibition.

Mentions: Figure 3 provides a schematic description of the RECOD model (Breitmeyer & Öğmen, 2006; Öğmen, 1993) whose dual-channel structure can account for the dissociation between visibility and masking effectiveness. In this model, the input is conveyed to post-retinal networks through two major pathways corresponding to parvocellular (P) and magnocellular (M) pathways of the primate visual system. The post retinal areas receiving their major inputs from P and M pathways are also refered to as sustained and transient channels. In the model, the visibility of a stimulus as it relates to its brightness, contours, etc. is associated with activity in the sustained channels. The major suppressive effect in metacontrast is an inhibition from the transient channel on the sustained channel. Thus, because visibility and metacontrast masking effectiveness relate to two different processes, sustained and transient channel activities, respectively, the model can account for the aforementioned dissociation. The validity of this claim has been demonstrated by quantitative simulations (Öğmen, Breitmeyer, & Bedell, 2006; Öğmen, Breitmeyer, Todd et al., 2006). In summary, the RECOD model provides a mechanistic explanation of how motion deblurring can take place in retinotopic space.


A theory of moving form perception: Synergy between masking, perceptual grouping, and motion computation in retinotopic and non-retinotopic representations.

Oğmen H - Adv Cogn Psychol (2008)

A schematic description of the RECOD model. The open and filled synaptic						symbols depict excitatory and inhibitory connections, respectively. To avoid						clutter, only a small part of the networks and connections are shown. The						inter-channel inhibitory connection from the transient channel onto the						sus-tained channel represents the interchannel						"transient-on-sustained" inhibition.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2864981&req=5

Figure 3: A schematic description of the RECOD model. The open and filled synaptic symbols depict excitatory and inhibitory connections, respectively. To avoid clutter, only a small part of the networks and connections are shown. The inter-channel inhibitory connection from the transient channel onto the sus-tained channel represents the interchannel "transient-on-sustained" inhibition.
Mentions: Figure 3 provides a schematic description of the RECOD model (Breitmeyer & Öğmen, 2006; Öğmen, 1993) whose dual-channel structure can account for the dissociation between visibility and masking effectiveness. In this model, the input is conveyed to post-retinal networks through two major pathways corresponding to parvocellular (P) and magnocellular (M) pathways of the primate visual system. The post retinal areas receiving their major inputs from P and M pathways are also refered to as sustained and transient channels. In the model, the visibility of a stimulus as it relates to its brightness, contours, etc. is associated with activity in the sustained channels. The major suppressive effect in metacontrast is an inhibition from the transient channel on the sustained channel. Thus, because visibility and metacontrast masking effectiveness relate to two different processes, sustained and transient channel activities, respectively, the model can account for the aforementioned dissociation. The validity of this claim has been demonstrated by quantitative simulations (Öğmen, Breitmeyer, & Bedell, 2006; Öğmen, Breitmeyer, Todd et al., 2006). In summary, the RECOD model provides a mechanistic explanation of how motion deblurring can take place in retinotopic space.

Bottom Line: Based on this duration of visible persistence, we would expect moving objects to appear highly blurred.However, in human vision, objects in motion typically appear relatively sharp and clear.We suggest that clarity of form in dynamic viewing is achieved by a synergy between masking, perceptual grouping, and motion computation across retinotopic and non-retinotopic representations.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical & Computer Engineering, Center for Neuro-Engineering & Cognitive Science, University of Houston, Houston, TX 77204-4005 USA.

ABSTRACT
Because object and self-motion are ubiquitous in natural viewing conditions, understanding how the human visual system achieves a relatively clear perception for moving objects is a fundamental problem in visual perception. Several studies have shown that the visible persistence of a briefly presented stationary stimulus is approximately 120 ms under normal viewing conditions. Based on this duration of visible persistence, we would expect moving objects to appear highly blurred. However, in human vision, objects in motion typically appear relatively sharp and clear. We suggest that clarity of form in dynamic viewing is achieved by a synergy between masking, perceptual grouping, and motion computation across retinotopic and non-retinotopic representations. We also argue that dissociations observed in masking are essential to create and maintain this synergy.

No MeSH data available.


Related in: MedlinePlus