Results 301 to 310 of about 8,622,404 (371)

Contrast tests of interaction hypothesis.

Psychological Methods, 1997
This article argues for the use of contrasts to test a priori interaction hypotheses in 2-way analysis of variance designs. It focuses on 3 underused types of interaction contrast tests: a "matching" pattern for cognate levels of row and column factors; the "qualitative quadratic," for monotonic profiles of means in the same direction but with opposed ...
R. Abelson, Deborah A. Prentice
semanticscholar   +2 more sources

Contrast media reactions: data analysis and hypothesis.

Radiology, 1980
Two hundred and twenty-eight deaths due to the use of contrast media are reported, including 15 from intravenous cholangiography, 69 from angiography, 140 from urography and four other. The causes are analyzed and the various explanations for reactions to contrast media are considered.
A. Lalli
semanticscholar   +3 more sources

Reactions to contrast media: testing the CNS hypothesis.

Radiology, 1981
Sodium iothalamate was injected intravenously into mice to test the hypothesis that reactions to contrast media are controlled by the central nervous system. Particular emphasis was placed on (a) the effect of the limbic portion of the brain on the hypothalamus and (b) the outflow through the autonomic nervous system.
A. Lalli, R. Greenstreet
semanticscholar   +3 more sources

Luminance and chromatic contrast sensitivity in dyslexia: the magnocellular deficit hypothesis revisited

NeuroReport, 2002
The hypothesis of a magnocellular channel deficit in dyslexia was tested. Subjects were 10-year-old dyslexics and normal readers. Psychophysical thresholds for luminance and chromatic contrasts were estimated using black and white and red and green sinusoidal gratings of various spatial frequencies, presented in static and dynamic conditions (drift and
D. Bednarek, A. Grabowska
semanticscholar   +3 more sources

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