The Familiar-Size Cue to Distance and Stereoscopic Depth Perception

Perception ◽  
1993 ◽  
Vol 22 (8) ◽  
pp. 985-995 ◽  
Author(s):  
John Predebon
Keyword(s):  
Depth Perception ◽  
Size Effects ◽  
Stereoscopic Depth ◽  
Familiar Size ◽  
Unfamiliar Object

The role of the familiar-size cue to distance in stereoscopic depth perception was examined in two experiments. In experiment 1 subjects judged the depth of a binocularly viewed interval, the far point of which was defined by either a familiar or an unfamiliar object, and in experiment 2 subjects adjusted the depth of the interval so that its extent appeared equal to the length of a vertical reference extent positioned on the surface of the object. Although familiar size influenced depth estimates (experiment 1) it did not influence matching judgments (experiment 2). The findings are discussed with reference to the issue of the nature of the familiar-size effects on judgments of stereoscopic depth.

scholarly journals Early development of corn seedlings primed with synthetic tenorite nanofertilizer

2020 ◽  
Vol 42 ◽  
Author(s):  
Michel Esper Neto ◽  
David W. Britt ◽  
Kyle Alan Jackson ◽  
Alessandro Lucca Braccini ◽  
Tadeu Takeyoshi Inoue ◽  
...  
Keyword(s):  
Seed Germination ◽  
Size Effects ◽  
Seed Priming ◽  
Seedling Development ◽  
Cuo Nanoparticles ◽  
The Other ◽  
Corn Seed ◽  
Cu Toxicity ◽  
Germination And Growth

Abstract: Fertilizer formulation alternatives that avoid unnecessary losses and environmental impacts are being investigated in agricultural management. Seed priming with nanofertilizers prior to planting, reduces concerns about non-target dispersion; however, priming formulations and concentrations must be carefully selected to avoid undesired effects. Here, seed germination and seedling development were evaluated after seed priming with CuO nanoparticles (NPs), CuO bulk and CuCl2. The seeds were immersed in priming solutions of 0, 20, 40, 80 and 160 mg.L−1 Cu for the three Cu sources. Following 8 hours priming, the seeds were evaluated for germination and vigor (first germination count). Root and shoot lengths were measured as well as shoot and root dry biomass. The copper NP did not show any toxic effects on corn seed germination and growth, and also promoted higher biomass when compared to the other Cu sources. On the other hand, CuCl2 primed seeds exhibited Cu-toxicity in roots and shoots for all concentrations tested. Bulk Cu priming results indicated the better role of NPs size effects. These findings support NP-seed priming as an alternative to delivery of essential micronutrients, such as copper, to corn seedlings.

Role of Quantum-size Effects on the Dehydrogenation of CH4 on 3d TMn Clusters: DFT Calculations Combined with Data Mining

2022 ◽  
Author(s):  
Karla Furtado Andriani ◽  
Priscilla Felício Sousa ◽  
Felipe Orlando Morais ◽  
Juarez L. F. Da Silva
Keyword(s):  
Data Mining ◽  
Transition Metal ◽  
Dft Calculations ◽  
Theoretical Investigation ◽  
Size Effects ◽  
Metal Clusters ◽  
Quantum Size Effects ◽  
Transition Metal Clusters ◽  
Quantum Size

In this work, we report a theoretical investigation of the role of quantum-size effects (QSE) on the dehydrogenation of methane (CH4) on 3d transition-metal clusters, TMn , where TM =...

Influence of sonic noise on human stereoscopic depth perception

AIHAJ ◽  
1979 ◽  
Vol 40 (5) ◽  
pp. 427-435 ◽  
Author(s):  
EDWARD R. HERMANN ◽  
CAROLYN S. HESSE ◽  
E. ROBINSON HOYLE ◽  
ANNE C. LEOPOLD ◽  
JOHN J. STANDARD
Keyword(s):  
Depth Perception ◽  
Stereoscopic Depth

The Familiar-Size Cue to Depth under Reduced-Cue Viewing Conditions

Perception ◽  
1994 ◽  
Vol 23 (11) ◽  
pp. 1301-1312 ◽  
Author(s):  
John Predebon ◽  
Jacob Steven Woolley
Keyword(s):  
Motion Parallax ◽  
Verbal Report ◽  
Major Determinant ◽  
Relative Distance ◽  
Head Motion ◽  
Familiar Size ◽  
Verbal Reports ◽  
Direct Reports ◽  
Visual Conditions

The familiar-size cue to perceived depth was investigated in five experiments. The stimuli were stationary familiar objects viewed monocularly under otherwise completely darkened visual conditions. Perceived depth was measured directly with the method of verbal report and indirectly with the head-motion procedure. Although the familiar-size cue influenced verbal reports of the distances of the objects, it did not determine perceived depth as assessed with the head-motion procedure. These findings support the claim that familiar size is not a major determinant of perceived depth, and that cognitive or nonperceptual factors mediate the effects of familiar size on direct reports of depth and distance. Possible reasons for the failure of familiar size to influence the head-motion-derived measures of perceived depth are discussed with particular emphasis on the role of motion parallax in determining perceptions of depth and relative distance.

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