The human focal electroretinogram as a function of stimulus area

1990 ◽  
Vol 75 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Pierangelo Errico ◽  
Benedetto Falsini ◽  
Vittorio Porciatti ◽  
Francesco Maria Cefal�
Keyword(s):  
Focal Electroretinogram ◽  
Stimulus Area

scholarly journals Senescent changes in parafoveal color appearance: saturation as a function of stimulus area

2002 ◽  
Vol 19 (1) ◽  
pp. 208 ◽  
Author(s):  
Holger Knau ◽  
John S. Werner
Keyword(s):  
Color Appearance ◽  
Stimulus Area

Difference of Spatial Summation Property between b and d Waves in Focal Electroretinogram of the Cat

1992 ◽  
Vol 205 (4) ◽  
pp. 204-210
Author(s):  
Tomoaki Usui
Keyword(s):  
Spatial Summation ◽  
Focal Electroretinogram

Central retina vein occlusion: visual acuity correlate with focal electroretinogram, but not with optical coherence tomography

2011 ◽  
Vol 89 (s248) ◽  
pp. 0-0
Author(s):  
G RUBERTO ◽  
C TINELLI ◽  
M LIZZANO ◽  
P PICCININI ◽  
F CALMA ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Acuity ◽  
Optical Coherence ◽  
Focal Electroretinogram ◽  
Vein Occlusion ◽  
Central Retina

scholarly journals Correlation of Macular Focal Electroretinogram with Ellipsoid Zone Extension in Stargardt Disease

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Edoardo Abed ◽  
Giorgio Placidi ◽  
Luigi Calandriello ◽  
Marco Piccardi ◽  
Francesca Campagna ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Negative Relationship ◽  
Macular Thickness ◽  
Stargardt Disease ◽  
Macular Function ◽  
Ellipsoid Zone ◽  
Focal Electroretinogram ◽  
Cone Function

Stargardt disease (STGD1) is the most common cause of inherited juvenile macular degeneration. This disease is characterized by a progressive accumulation of lipofuscin in the outer retina and subsequent loss of photoreceptors and retinal pigment epithelium. The aim of this study was to evaluate the relationship between cone photoreceptor function and structure in STGD1. Macular function was assessed by visual acuity measurement and focal electroretinogram (FERG) recording while spectral domain optical coherence tomography (SD-OCT) imaging was performed to evaluate the integrity of photoreceptors. FERG amplitude was significantly reduced in patients with Stargardt disease (p<0.0001). The amplitude of FERG showed a negative relationship with interruption of ellipsoid zone (EZ) (R2=0.54, p<0.0001) and a positive correlation with average macular thickness (AMT). Conversely, visual acuity was only weakly correlated with central macular thickness (CMT) (R2=0.12, p=0.04). In conclusion, this study demonstrates that FERG amplitude is a reliable indicator of macular cone function while visual acuity reflects the activity of the foveal region. A precise assessment of macular cone function by FERG recording may be useful to monitor the progression of STGD1 and to select the optimal candidates to include in future clinical trials to treat this disease.

scholarly journals Optical coherence tomographic pattern and focal electroretinogram in patients with retinitis pigmentosa

Eye ◽  
2008 ◽  
Vol 23 (2) ◽  
pp. 299-303 ◽  
Author(s):  
A Oishi ◽  
H Nakamura ◽  
I Tatsumi ◽  
M Sasahara ◽  
H Kojima ◽  
...  
Keyword(s):  
Retinitis Pigmentosa ◽  
Optical Coherence ◽  
Focal Electroretinogram

The Effects of Stimulus Area and Adaptation Temperature on Warm and Heat Pain Thresholds in Man

1987 ◽  
Vol 32 (3-4) ◽  
pp. 875-880 ◽  
Author(s):  
Ilpo Kojo ◽  
Antti Pertovaara
Keyword(s):  
Heat Pain ◽  
Pain Thresholds ◽  
Stimulus Area

H-13 Translocation of PKCa Distribution in Vascular Endothelial Cells to Mechanical Stimulus area

2016 ◽  
Vol 2016.69 (0) ◽  
pp. 327-328
Author(s):  
Takumi HASEGAWA ◽  
Masataka Arai ◽  
Toshihiro SERA ◽  
Susumu KUDO
Keyword(s):  
Endothelial Cells ◽  
Vascular Endothelial Cells ◽  
Mechanical Stimulus ◽  
Vascular Endothelial ◽  
Stimulus Area

Stimulus area, stimulus dispersion, flash duration, and the scotopic threshold.

1955 ◽  
Vol 49 (6) ◽  
pp. 428-430 ◽  
Author(s):  
Oscar S. Adams ◽  
Davis J. Chambliss ◽  
Arthur J. Riopelle
Keyword(s):  
Flash Duration ◽  
Stimulus 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.

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