Why are we Right-Handed?
نویسندگان
چکیده
منابع مشابه
Why Are We Right Handed
ness for according to himself uncivilized man tends to the same practice. The wild aborigines in the Andaman Islands use their right hands for the actual discharge of the arrow from the bow. It is the same with semi-civilized races on the N. W. Frontier, in Somaliland, and elsewhere that I have observed. Let Ur. Jaensch more carefully observe an infant and he will see its pronounced tendency to...
متن کاملHandedness and Language Lateralization: Why Are We Right-handed and Left-brained?
Around 90% of humans prefer their right hand for unimanual actions and are lefthemisphere dominant for language functions; a pattern far from negligible. The phenomena of handedness and cerebral lateralization for language are presented along with the different theories that attempt to explain the presence of these functional asymmetries. The focus is on the adaptive advantages both on the indi...
متن کاملDesign-Why We Don't Do It Right
The design process will be discussed as it is done today and show through examples why we do not do it correctly. The place for simulation in the design process will be emphasized and how it is not applied very well, consistently, or enough through out the design process will be highlighted. Dr. John Hines is a Senior Scientist in the Platform Connectivity Branch of the Information Directorate ...
متن کاملLeptogenesis from Right-handed Neutrino Decays to Right-handed Leptons
We investigate what would be the consequences for leptogenesis of the existence of a charged SU(2)L singlet scalar δ . If such a scalar particle exists it allows the right-handed neutrinos to couple not only to left-handed lepton and Higgs doublets as in ordinary leptogenesis, but also to a right-handed charged lepton and a δ. This provides a new source of leptogenesis which can be successful i...
متن کاملWhy are some people left-handed? An evolutionary perspective.
Since prehistoric times, left-handed individuals have been ubiquitous in human populations, exhibiting geographical frequency variations. Evolutionary explanations have been proposed for the persistence of the handedness polymorphism. Left-handedness could be favoured by negative frequency-dependent selection. Data have suggested that left-handedness, as the rare hand preference, could represen...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Scientific American
سال: 1910
ISSN: 0036-8733
DOI: 10.1038/scientificamerican03261910-260a