Results show that at 2 to 4 weeks of age, the mean strength of a pulsatile air-jet stimulus that was required to induce arousal during quiet sleep was significantly lower in male infants than female infants.
Horne and lead author Heidi L. Richardson, PhD, studied 50 healthy infants who were evaluated at both ages by daytime polysomnography, which was performed in a sleep laboratory where light and noise were minimal. Infants were placed on their backs in a bassinet to sleep. Arousability was assessed using a five-second, pulsatile jet of air that was delivered with a hand-held cannula to the nostrils. Air pressure was increased between consecutive stimuli until an arousal response was observed. Responses to each stimulus were classified as either non-arousal, subcortical activation or full cortical arousal.
According to the authors, the finding that infant girls appeared to sleep more soundly than infant boys is consistent with previous reports of increased sleep disruption in male infants. Mothers tend to perceive that infant boys have sleep patterns that include more problematic crying and increased night awakenings.The authors suspect that mothers may be more likely to try to calm restless male infants by putting them to sleep on their stomach, which may contribute to the gender difference in the rate of SIDS. Approximately 60 percent of SIDS victims are male, reports Horne.
Kathleen McCann | EurekAlert!
The importance of biodiversity in forests could increase due to climate change
17.11.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
Win-win strategies for climate and food security
02.10.2017 | International Institute for Applied Systems Analysis (IIASA)
High-precision measurement of the g-factor eleven times more precise than before / Results indicate a strong similarity between protons and antiprotons
The magnetic moment of an individual proton is inconceivably small, but can still be quantified. The basis for undertaking this measurement was laid over ten...
Heat from the friction of rocks caused by tidal forces could be the “engine” for the hydrothermal activity on Saturn's moon Enceladus. This presupposes that...
The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.
Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
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15.11.2017 | Event News
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24.11.2017 | Earth Sciences