scholarly journals What is the spatial integration area for global motion perception in human central vision?

2011 ◽  
Vol 11 (11) ◽  
pp. 704-704 ◽  
Author(s):  
T. Ledgeway ◽  
P. McGraw ◽  
A. Simmers
Keyword(s):  
Motion Perception ◽  
Spatial Integration ◽  
Global Motion ◽  
Central Vision ◽  
Integration Area

scholarly journals The Effect of Stimulus Area on Global Motion Thresholds in Children and Adults

Vision ◽  
2019 ◽  
Vol 3 (1) ◽  
pp. 10
Author(s):  
Kimberly Meier ◽  
Deborah Giaschi
Keyword(s):  
Motion Perception ◽  
Spatial Integration ◽  
Global Motion ◽  
Motion Stimulus ◽  
Stimulus Area ◽  
Displacement Condition ◽  
Per Se ◽  
Spatial Displacements ◽  
Late Maturation ◽  
The Impact

Performance on random-dot global motion tasks may reach adult-like levels before 4 or as late as 16 years of age, depending on the specific parameters used to create the stimuli. Later maturation has been found for slower speeds, smaller spatial displacements, and sparser dot arrays. This protracted development on global motion tasks may depend on limitations specific to spatial aspects of a motion stimulus rather than to motion mechanisms per se. The current study investigated the impact of varying stimulus area (9, 36, and 81 deg2) on the global motion coherence thresholds of children 4–6 years old and adults for three signal dot displacements (∆x = 1, 5, and 30 arcmin). We aimed to determine whether children could achieve mature performance for the smallest displacements, a condition previously found to show late maturation, when a larger stimulus area was used. Coherence thresholds were higher in children compared to adults in the 1 and 5 arcmin displacement conditions, as reported previously, and this did not change as a function of stimulus area. However, both children and adults performed better with a larger stimulus area in the 30 arcmin displacement condition only. This suggests that immature spatial integration, as measured by stimulus area, cannot account for immaturities in global motion perception.

scholarly journals The role of cortical area V5/MT+ in speed-tuned directional anisotropies in global motion perception

2007 ◽  
Vol 47 (7) ◽  
pp. 887-898 ◽  
Author(s):  
Deborah Giaschi ◽  
Amy Zwicker ◽  
Simon Au Young ◽  
Bruce Bjornson
Keyword(s):  
Motion Perception ◽  
Cortical Area ◽  
Global Motion

scholarly journals Development of Global Motion Perception Requires Early Postnatal Exposure to Patterned Light

2009 ◽  
Vol 19 (8) ◽  
pp. 645-649 ◽  
Author(s):  
Donald E. Mitchell ◽  
Jan Kennie ◽  
Diane Kung
Keyword(s):  
Motion Perception ◽  
Global Motion ◽  
Postnatal Exposure

scholarly journals Normal development of pattern motion sensitivity in macaque monkeys

2008 ◽  
Vol 25 (5-6) ◽  
pp. 675-684 ◽  
Author(s):  
CYNTHIA HALL-HARO ◽  
LYNNE KIORPES
Keyword(s):  
Motion Perception ◽  
Discrimination Performance ◽  
Macaca Nemestrina ◽  
Global Motion ◽  
Complex Motion ◽  
Motion Sensitivity ◽  
Macaque Monkeys ◽  
Discrimination Ability ◽  
Pattern Motion ◽  
Neurophysiological Data

AbstractWe studied the development of sensitivity to complex motion using plaid patterns. We hypothesized, based on neurophysiological data showing a dearth of pattern direction–selective (PDS) cells in area medial temporal (MT) of infant macaques, that sensitivity to pattern motion would develop later than other forms of global motion sensitivity. We tested 10 macaque monkeys (Macaca nemestrina) ranging in age from 7 weeks to 109–160 weeks (adult). The monkeys discriminated horizontal from vertical pattern motion; sensitivity for one-dimensional (1D) direction discrimination and detection were tested as control tasks. The results show that pattern motion discrimination ability develops relatively late, between 10 and 18 weeks, while performance on the 1D control tasks was excellent at the earliest test ages. Plaid discrimination performance depends on both the speed and spatial scale of the underlying patterns. However, development is not limited by contrast sensitivity. These results support the idea that pattern motion perception depends on a different mechanism than other forms of global motion perception and are consistent with the idea that the representation of PDS neurons in MT may limit the development of complex motion perception.

scholarly journals Attention modulates neuronal correlates of interhemispheric integration and global motion perception

2014 ◽  
Vol 14 (12) ◽  
pp. 30-30 ◽  
Author(s):  
B. Akin ◽  
C. Ozdem ◽  
S. Eroglu ◽  
D. T. Keskin ◽  
F. Fang ◽  
...  
Keyword(s):  
Motion Perception ◽  
Global Motion

The chromatic input to global motion perception

2003 ◽  
Vol 20 (4) ◽  
pp. 421-428 ◽  
Author(s):  
ALEXA I. RUPPERTSBERG ◽  
SOPHIE M. WUERGER ◽  
MARCO BERTAMINI
Keyword(s):  
Motion Perception ◽  
Contrast Threshold ◽  
Motion Processing ◽  
Global Motion ◽  
Complex Motion ◽  
Motion Mechanism ◽  
Parvocellular Pathway ◽  
Simple Detection ◽  
Contrast Thresholds ◽  
Luminance Range

For over 30 years there has been a controversy over whether color-defined motion can be perceived by the human visual system. Some results suggest that there is no chromatic motion mechanism at all, whereas others do find evidence for a purely chromatic motion mechanism. Here we examine the chromatic input to global motion processing for a range of color directions in the photopic luminance range. We measure contrast thresholds for global motion identification and simple detection using sparse random-dot kinematograms. The results show a discrepancy between the two chromatic axes: whereas it is possible for observers to perform the global motion task for stimuli modulated along the red–green axis, we could not assess the contrast threshold required for stimuli modulated along the yellowish-violet axis. The contrast required for detection for both axes, however, are well below the contrasts required for global motion identification. We conclude that there is a significant red–green input to global motion processing providing further evidence for the involvement of the parvocellular pathway. The lack of S-cone input to global motion processing suggests that the koniocellular pathway mediates the detection but not the processing of complex motion for our parameter range.

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