Functional specialization in human dorsal pathway for stereoscopic depth processing

2020 ◽  
Vol 238 (11) ◽  
pp. 2581-2588
Author(s):  
Nihong Chen ◽  
Zhimin Chen ◽  
Fang Fang
Keyword(s):  
Stereoscopic Depth ◽  
Functional Specialization ◽  
Dorsal Pathway ◽  
Depth Processing

Stereoscopic depth processing in the visual cortex: a coarse-to-fine mechanism

10.1038/nn986 ◽  
2002 ◽  
Vol 6 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Michael D. Menz ◽  
Ralph D. Freeman
Keyword(s):  
Visual Cortex ◽  
Stereoscopic Depth ◽  
Depth Processing ◽  
Coarse To Fine

Perceived Frontal Size as a Determiner of Perceived Stereoscopic Depth

1957 ◽  
Author(s):  
W. C. Gogel
Keyword(s):  
Stereoscopic Depth

Does functional specialization affect collaborative development? Evidence from four Chinese metropolitan areas

2021 ◽  
Author(s):  
Pengfei Zhang ◽  
Zhiwei Liu ◽  
Xuemin Liu ◽  
Yu Hao ◽  
Yuhai Wang
Keyword(s):  
Metropolitan Areas ◽  
Functional Specialization ◽  
Collaborative Development

Temporal Dynamics of Shape Processing Differentiate Contributions of Dorsal and Ventral Visual Pathways

2019 ◽  
Vol 31 (6) ◽  
pp. 821-836 ◽  
Author(s):  
Elliot Collins ◽  
Erez Freud ◽  
Jana M. Kainerstorfer ◽  
Jiaming Cao ◽  
Marlene Behrmann
Keyword(s):  
Visual Information ◽  
Temporal Dynamics ◽  
Object Perception ◽  
Visual Pathway ◽  
Shape Sensitivity ◽  
Shape Information ◽  
Dorsal Pathway ◽  
Ventral Visual Pathway ◽  
Shape Processing ◽  
Ventral Pathway

Although shape perception is primarily considered a function of the ventral visual pathway, previous research has shown that both dorsal and ventral pathways represent shape information. Here, we examine whether the shape-selective electrophysiological signals observed in dorsal cortex are a product of the connectivity to ventral cortex or are independently computed. We conducted multiple EEG studies in which we manipulated the input parameters of the stimuli so as to bias processing to either the dorsal or ventral visual pathway. Participants viewed displays of common objects with shape information parametrically degraded across five levels. We measured shape sensitivity by regressing the amplitude of the evoked signal against the degree of stimulus scrambling. Experiment 1, which included grayscale versions of the stimuli, served as a benchmark establishing the temporal pattern of shape processing during typical object perception. These stimuli evoked broad and sustained patterns of shape sensitivity beginning as early as 50 msec after stimulus onset. In Experiments 2 and 3, we calibrated the stimuli such that visual information was delivered primarily through parvocellular inputs, which mainly project to the ventral pathway, or through koniocellular inputs, which mainly project to the dorsal pathway. In the second and third experiments, shape sensitivity was observed, but in distinct spatio-temporal configurations from each other and from that elicited by grayscale inputs. Of particular interest, in the koniocellular condition, shape selectivity emerged earlier than in the parvocellular condition. These findings support the conclusion of distinct dorsal pathway computations of object shape, independent from the ventral pathway.

scholarly journals What Does Dorsal Cortex Contribute to Perception?

Open Mind ◽  
2020 ◽  
Vol 4 ◽  
pp. 40-56 ◽  
Author(s):  
Erez Freud ◽  
Marlene Behrmann ◽  
Jacqueline C. Snow
Keyword(s):  
Functional Role ◽  
Object Perception ◽  
Visuomotor Control ◽  
Cognitive Mechanisms ◽  
Dorsal Cortex ◽  
Present Evidence ◽  
Visual Attributes ◽  
Dorsal Pathway ◽  
Solid Objects ◽  
Current Article

According to the influential “Two Visual Pathways” hypothesis, the cortical visual system is segregated into two pathways, with the ventral, occipitotemporal pathway subserving object perception, and the dorsal, occipitoparietal pathway subserving the visuomotor control of action. However, growing evidence suggests that the dorsal pathway also plays a functional role in object perception. In the current article, we present evidence that the dorsal pathway contributes uniquely to the perception of a range of visuospatial attributes that are not redundant with representations in ventral cortex. We describe how dorsal cortex is recruited automatically during perception, even when no explicit visuomotor response is required. Importantly, we propose that dorsal cortex may selectively process visual attributes that can inform the perception of potential actions on objects and environments, and we consider plausible developmental and cognitive mechanisms that might give rise to these representations. As such, we consider whether naturalistic stimuli, such as real-world solid objects, might engage dorsal cortex more so than simplified or artificial stimuli such as images that do not afford action, and how the use of suboptimal stimuli might limit our understanding of the functional contribution of dorsal cortex to visual perception.

scholarly journals Brain functional specialization and cooperation in Parkinson’s disease

2021 ◽  
Author(s):  
Jinmei Sun ◽  
Xiaoran Gao ◽  
Qiang Hua ◽  
Rongrong Du ◽  
Pingping Liu ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Functional Specialization
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