منابع مشابه
Confusion surrounds physical activity prescription for pregnant women.
There is strong evidence indicating that physical activity during pregnancy has significant health and quality of life benefits for both pregnant women and their unborn children. With pregnancy seen as a ‘teachable moment’, it presents as an opportune time to bring about positive behavioural changes, including increases in weekly physical activity. Unfortunately, few pregnant women are sufficie...
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In an inhomogeneous checkerboard surround, the lighter check darkens an incremental test patch more than the darker check lightens it. However, decremental test patches are influenced equally [Schirillo & Shevell, 1996. Vision Research, 36, 1783-1796]. In the current study, we manipulate the spatial arrangement of a checkerboard surround to produce T-junctions that perceptually group the checks...
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Unison remains uncertain about the future of primary care, despite receiving further assurances from health secretary Patricia Hewitt last week.
متن کاملHow surrounds affect chromaticity discrimination.
Chromatic discrimination thresholds were measured with and without surrounds along two cardinal axes of chromaticity space. On one axis the level of short-wavelength-sensitive (SWS)-cone excitation was varied for constant long-wavelength-sensitive (LWS)-cone and medium-wavelength-sensitive (MWS)-cone excitations, and on the other axis there were equal and opposite changes in LWS-cone and MWS-co...
متن کاملVisual masking by flickering surrounds.
Observers detected drifting sine-wave gratings presented in a circular 3 dia test field which was surrounded by a 3.25 degrees wide annulus. Forced choice contrast thresholds were measured with surrounds consisting of a steady field of light or uniform sinusoidal flicker. The flickering surround raised detection thresholds only for gratings with spatial frequencies below 2-4 c/deg. Variations o...
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ژورنال
عنوان ژورنال: Canadian Medical Association Journal
سال: 2008
ISSN: 0820-3946,1488-2329
DOI: 10.1503/cmaj.071705