ALTOONA, PA, United States (UPI) -- U.S. scientists say a father`s scent may delay the onset of sexual maturity in daughters -- part of an evolutionary strategy to prevent inbreeding.
'Biological fathers send out inhibitory chemical signals to their daughters,' said Robert Matchock, assistant professor of psychology at Penn State University`s Altoona Campus. 'In the absence of these signals, girls tend to sexually mature earlier.'
The effect of chemical cues on sexual maturity is common in the animal world, Matchock said, noting when the biological father is removed from rodent families, the daughters tend to mature faster.
Researchers, including Elizabeth Susman, professor of biobehavioral health at Penn State, collected menarcheal data from 1,938 college students. The data included information on factors such as the girls` family size, social environment, and how long the father had been absent.
'Our results indicate that girls without fathers matured approximately three months before girls whose fathers were present,' Matchock said, adding the data seem to suggest a relationship between length of the father`s absence and age of menarche -- the earlier the absence, the earlier the menarche.
The study is detailed in the American Journal of Human Biology.
Copyright 2006 by United Press International
Ever since Descartes, the tendency in the West has been to view humans as being unique from other animals in possessing a soul. Animals, so far as Descartes was concerned, were mere machines. Humans, on the other hand, were essentially or most importantly the possessors of souls.
Yet, modern science daily discovers new things about us and other animals that seem to draw us closer and closer to the notion that we are just one more species of animal. In the above news story, for example, it is discovered that humans behave very much like rodents in one peculiar way.
Is this yet more evidence that humans are not the uniquely disembodied spirits DesCartes imagined, but rather just another species of animal?
Which do you think is more plausible:
Only humans have souls.
All living things have souls.
All things, living or not, have souls.
No things have souls.
'Biological fathers send out inhibitory chemical signals to their daughters,' said Robert Matchock, assistant professor of psychology at Penn State University`s Altoona Campus. 'In the absence of these signals, girls tend to sexually mature earlier.'
The effect of chemical cues on sexual maturity is common in the animal world, Matchock said, noting when the biological father is removed from rodent families, the daughters tend to mature faster.
Researchers, including Elizabeth Susman, professor of biobehavioral health at Penn State, collected menarcheal data from 1,938 college students. The data included information on factors such as the girls` family size, social environment, and how long the father had been absent.
'Our results indicate that girls without fathers matured approximately three months before girls whose fathers were present,' Matchock said, adding the data seem to suggest a relationship between length of the father`s absence and age of menarche -- the earlier the absence, the earlier the menarche.
The study is detailed in the American Journal of Human Biology.
Copyright 2006 by United Press International
Ever since Descartes, the tendency in the West has been to view humans as being unique from other animals in possessing a soul. Animals, so far as Descartes was concerned, were mere machines. Humans, on the other hand, were essentially or most importantly the possessors of souls.
Yet, modern science daily discovers new things about us and other animals that seem to draw us closer and closer to the notion that we are just one more species of animal. In the above news story, for example, it is discovered that humans behave very much like rodents in one peculiar way.
Is this yet more evidence that humans are not the uniquely disembodied spirits DesCartes imagined, but rather just another species of animal?
Which do you think is more plausible:
Only humans have souls.
All living things have souls.
All things, living or not, have souls.
No things have souls.