منابع مشابه
The history of dipper functions.
Dipper-shaped curves often accurately depict the relationship between a baseline, or "pedestal," magnitude and a just noticeable difference in it. This tutorial traces the 45-year history of the dipper function in auditory and visual psychophysics, focusing on when they happen and why. Popular theories of both positive and negative masking (i.e., the "handle" and "dip," respectively) are descri...
متن کاملDiscriminating contrast discontinuities: asymmetries, dipper functions, and perceptual learning
In a visual search task, a target has to be found among distractors. For two given elements A and B, the search difficulty can depend on which of the two elements is defined as the target, a phenomenon called search asymmetry. Here, we study to what degree an element's ability to 'win' in a search asymmetry depends on its absolute contrast (first-stage signal) and to what degree it depends on i...
متن کاملRoosts and migrations of swallows
— Swallows of the north temperate zone display a wide variety of territorial behaviour during the breeding season, but as soon as breeding is over, they all appear to adopt a pattern of independent diurnal foraging interleaved with aggregation every night in dense roosts. Swallows generally migrate during the day, feeding on the wing. On many stretches of their annual journeys, their migrations...
متن کاملRelation of red cell distribution width with dipper and non-dipper hypertension.
Aim Red cell distribution width (RDW), an index of erythrocyte size, is associated with high risk for cardiovascular disease. Nondipping hypertension (HT) is lack of nocturnal fall in blood pressure(BP). The association between RDW and non-dipping BP in normotensive and hypertensive patients was investigated. Methods A total of 170 patients were categorized into 4 groups: Normotensive-Dipper (N...
متن کاملVariation in Shorebird Use of Diurnal, High-tide Roosts: How Consistently are Roosts Used?
—In coastal environs during the non-breeding season, many shorebirds (suborder Charadrii) congregate at roosts, long considered to be traditional sites where flocks of individuals coalesce when high tides inundate feeding areas. Humboldt Bay, California was surveyed (9.5 months at roughly 10-d intervals) to assess temporal variation in incidence (proportion of 28 surveys birds used a roost), pr...
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ژورنال
عنوان ژورنال: Bird Study
سال: 1979
ISSN: 0006-3657,1944-6705
DOI: 10.1080/00063657909476635