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What is the spatial-frequency hypothesis

Neuropsychological and functional imagery data have suggested that each hemisphere (at the level of temporo–parietal junctions—TPJ) could play a key role in spatial frequency processing: The right TPJ should predominantly be involved in low spatial frequency (LFs) analysis and the left TPJ in high spatial frequency (HFs) analysis.

(1968) Effects of the high-intensity electric field of industrial frequency.

Results showed a hemispheric specialization for spatial frequency processing and different ‘precedence effects’ depending on the visual field of presentation.">

K. Spatial Frequency Image Analysis Flashcards | Quizlet

Results showed a hemispheric specialization for spatial frequency processing and different ‘precedence effects’ depending on the visual field of presentation.

However, the proposed framework does not exclude the possibility that family associations might arise through different pathways. For example, cooperatively breeding Long-tailed Tits () are short-lived and individuals always attempt to breed in their first year of life, as predicted by life-history theory. Interestingly, in this species, family cohesion is reached through a different pathway. Owing to high nest predation, population density is low, reducing kin competition and giving offspring the option to delay dispersal and remain associated with their parents throughout their first winter. Then, they disperse and attempt to reproduce independently, but return to the parental territory to help their relatives if their own breeding attempt fails. In this species, family living seems unrelated to life-history characteristics and appears instead linked to environmental factors that allow the family structure to be kept after the breeding season and to their nesting in close spatial association.

In accordance with the spatial-frequency hypothesis, ..

The aims of this research are (i) to investigate, in healthy subjects, the hemispheric asymmetry hypothesis with an explicit manipulation of spatial frequencies of natural scenes and (ii) to examine whether the ‘precedence effect’ (the relative rapidity of LFs and HFs processing) depends on the visual field of scene presentation or not.

Chandra, our best X-ray observatory, may also not have the sensitivity or persistence needed to detect very high mass ratio LMXRBs, or those that absorb their star's matter very infrequently or in very small doses.

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of spatial frequency response is still incomplete because ..

Nevertheless, this functional hypothesis had been inferred from data obtained when using the hierarchical form paradigm, without any explicit spatial frequency manipulation per se.

Meaning of "spatial frequency" in the English dictionary

AB - A masking paradigm was used to measure the spatial frequency and orientation tuning of spatial mechanisms in the albino visual system. Threshold elevation curves obtained in this manner at test spatial frequencies of 0.25 cycles/deg (cpd), 0.50 cpd, and 1 cpd have the same shape as curves obtained from normal subjects at test frequencies two octaves higher. Additional masking studies showed that contrast processing in albinos obeys the same compressive power law as in normals. Thus, spatial mechanisms in albino central vision have normal spatial frequency and orientation bandwidths. As central cones in the albino are spaced 3-4 times further apart than in the normal fovea, these results support the hypothesis that monocular spatial vision in albinos is primarily limited by this increased receptor spacing. It is hypothesized that this, in turn, is the result of arrested development of the albino retina.

Glossary of Terms: G - Physical Geography

These authors showed that the electric-field intensity at the surface of the body and induced currents passing through various segments of the body are determined by: (a) the characteristics of the applied electric field, i.e., field strength, spatial structure, and frequency; (b) the shape of the body; (c) the location of the body relative to ground and other conductors; and (d) any conduction currents from the body to ground or other conductors.

Saul Mineroff Electronics, Inc.

N2 - A masking paradigm was used to measure the spatial frequency and orientation tuning of spatial mechanisms in the albino visual system. Threshold elevation curves obtained in this manner at test spatial frequencies of 0.25 cycles/deg (cpd), 0.50 cpd, and 1 cpd have the same shape as curves obtained from normal subjects at test frequencies two octaves higher. Additional masking studies showed that contrast processing in albinos obeys the same compressive power law as in normals. Thus, spatial mechanisms in albino central vision have normal spatial frequency and orientation bandwidths. As central cones in the albino are spaced 3-4 times further apart than in the normal fovea, these results support the hypothesis that monocular spatial vision in albinos is primarily limited by this increased receptor spacing. It is hypothesized that this, in turn, is the result of arrested development of the albino retina.

Summation (neurophysiology) - Wikipedia

Electric fields near transmission lines and sub-stations At ground level, beneath high-voltage transmission lines, the electric fields created have the same frequencies as those carried by the power lines.

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