The filling-in phenomenon in vision and McIlwain's periphery effect

1974 ◽  
Vol 19 (4) ◽  
Author(s):  
J. Moors ◽  
A.M.L. Coenen ◽  
H.J.M. Gerrits ◽  
A.J.H. Vendrik
Keyword(s):  
Periphery Effect

scholarly journals Functional analysis of the periphery effect in human building related areas

2004 ◽  
Vol 22 (1) ◽  
pp. 15-26 ◽  
Author(s):  
Ifat Levy ◽  
Uri Hasson ◽  
Michal Harel ◽  
Rafael Malach
Keyword(s):  
Functional Analysis ◽  
Periphery Effect

EVIDENCE THAT McILWAIN'S PERIPHERY EFFECT IS NOT A STRAY LIGHT ARTIFACT

1965 ◽  
Vol 28 (3) ◽  
pp. 555-559 ◽  
Author(s):  
W. R. Levick ◽  
C. W. Oyster ◽  
D. L. Davis
Keyword(s):  
Stray Light ◽  
Periphery Effect

The psychophysical periphery effect crosses the vertical meridian

2001 ◽  
Vol 18 (4) ◽  
pp. 657-661
Author(s):  
THOMAS KUYK ◽  
DIANA NICULESCU
Keyword(s):  
Neural Mechanism ◽  
Spot Test ◽  
The Other ◽  
Vertical Meridian ◽  
Peripheral Stimulation ◽  
Test Spot ◽  
Cat Retina ◽  
Close Proximity ◽  
Test Thresholds ◽  
Periphery Effect

This study measured the periphery effect and compared its magnitude when the peripheral stimulation was on the same or opposite side of the vertical meridian as the test spot. Test thresholds for a 1.5-deg diameter, 8-ms spot located 1.75 deg to one side of the vertical meridian were elevated by approximately 0.125 log units when a 0.25 cycles/deg (cpd) counterphased grating was presented at a similar eccentric offset on the other side of the vertical meridian. The periphery effect disappeared when the test spot was moved outward to 8-deg eccentricity. When the grating and test were presented on the same side of the vertical meridian, test thresholds at both retinal locations were elevated by the same amount, 0.2 log units. Consistent with the physiology in cat retina, the periphery effect in humans also crosses over the vertical meridian. However, the effect is small and the test spot must be in close proximity to the vertical meridian for it to be observed. Also, the crossover periphery effect is reduced in magnitude by 37.5% compared to when the grating and test are presented on the same side of the vertical meridian. This suggests there may be a difference in how the underlying neural mechanism that transmits the periphery effect signal laterally is organized for sending the periphery effect signal across the vertical meridian as compared to within a retinal hemifield.

scholarly journals The contrast-response of the periphery effect

1998 ◽  
Vol 38 (13) ◽  
pp. 1983-1987
Author(s):  
Patti S Fuhr ◽  
Thomas Kuyk
Keyword(s):  
Periphery Effect ◽  
Contrast Response

(VS-112)MASKING AND FACILITATION IN THE HUMAN PERIPHERY EFFECT

2000 ◽  
Vol 77 (SUPPLEMENT) ◽  
pp. 35
Author(s):  
Patti S.W. Fuhr ◽  
Elizabeth McIntosh ◽  
Thomas Kuyk
Keyword(s):  
Periphery Effect

Comparative phylogeographic analysis suggests a shared history among eastern North American boreal forest birds

The Auk ◽  
2021 ◽  
Author(s):  
Joel Ralston ◽  
Alyssa M FitzGerald ◽  
Theresa M Burg ◽  
Naima C Starkloff ◽  
Ian G Warkentin ◽  
...  
Keyword(s):  
Genetic Structure ◽  
North America ◽  
Boreal Forest ◽  
North American ◽  
Forest Birds ◽  
Phylogeographic Structure ◽  
Individual Species ◽  
Peripheral Populations ◽  
Periphery Effect ◽  
Boreal Forest Birds

Abstract Phylogeographic structure within high-latitude North American birds is likely shaped by a history of isolation in refugia during Pleistocene glaciations. Previous studies of individual species have come to diverse conclusions regarding the number and location of likely refugia, but no studies have explicitly tested for biogeographic concordance in a comparative phylogeographic framework. Here we use a hierarchical approximate Bayesian computation analysis of mitochondrial DNA sequences from 653 individuals of 6 bird species that are currently co-distributed in the boreal forest of North America to test for biogeographic congruence. We find support for congruent phylogeographic patterns across species, with shallow divergence dating to the Holocene within each species. Combining genetic results with paleodistribution modeling, we propose that these species shared a single Pleistocene refugium south of the ice sheets in eastern North America. Additionally, we assess modern geographic genetic structure within species, focusing on Newfoundland and disjunct high-elevation populations at the southern periphery of ranges. We find evidence for a “periphery effect” in some species with significant genetic structure among peripheral populations and between peripheral and central populations. Our results suggest that reduced gene flow among peripheral populations, rather than discordant biogeographic histories, can explain the small differences in genetic structure and levels of genetic diversity among co-distributed boreal forest birds.

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