09 AUG 2014 by ideonexus
Brain Differences Between Sciences and Humanities
The areas of academic interest (sciences or humanities) and area of study have been known to be associated with a number of factors associated with autistic traits. However, despite the vast amount of literature on the psychological and physiological characteristics associated with faculty membership, brain structural characteristics associated with faculty membership have never been investigated directly. In this study, we used voxel-based morphometry to investigate differences in regional g... 1 
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notes18 NOV 2013 by ideonexus
Gender is Not Binary
he gender binary is the artificial division of the world into things that are "masculine" or "for men" and things that are "feminine" or "for women". One of the starkest ways to think of this is to consider the phrase "opposite sexes/genders" (as opposed to "different sexes/genders"), when both men and women are human beings with fundamentally many more commonalities than differences.
The division is artificial in several ways:
much of it is very clearly socially constructed. For example,...
1 Interesting concept from feminist and homosexual literature. The scientific point of view on this is that human males and females are dimorphic to various degrees.
20 SEP 2011 by ideonexus
Mating Strategies of Males and Females
A vivid demonstration of this difference can be seen by looking up the
record number of children sired by a human female versus a male. If you
were to guess the maximum number of children that a woman could
produce in a lifetime, you’d probably say around fifteen. Guess again.
The Guinness Book of World Records gives the “official” record number
of children for a woman as sixty-nine, produced by an eighteenth century
Russian peasant. In twenty-seven pregnancies between 1725 and
1745, sh... 1 notes
notesA Great summary of the differences between them evolutionarily.
20 SEP 2011 by ideonexus
Postmating Competition
Sexual selection doesn’t end with the sex act itself: males can continue
to compete even after mating. In many species, females mate with more
than one male over a short period of time. After a male inseminates a
female, how can he prevent other males from fertilizing her and stealing
his paternity? This postmating competition has produced some of the
most intriguing features built by sexual selection. Sometimes a male
hangs around after mating, guarding his female against other suitors.
Wh... 1 notes
notesVarious evolutionary strategies males of different species keep a female from mating with other males after sex.
24 JUL 2011 by ideonexus
Testosterone's Effect on Memory
Like many other areas of development, memory generally matures more rapidly in girls than boys. Beginning in the womb, female fetuses are known to habituate to auditory stimuli about two weeks earlier than males. After birth, they are more advanced at visual habituation. Toward the end of the first year, girls are about a month ahead in tests of short-term, explicit memory, like remembering, after a few seconds' distraction, where they just saw a toy being hidden. Girls also outperform boys o... 1 notes
notesMemory develops faster in females and testosterone appears to be the culprit.
08 JUN 2011 by ideonexus
More Females are Born in Times of Stress
A stress-related decline in the sex ratio is no anomaly, but a biological mechanism that evolved to keep the species going, according to Ralph Catalano, professor of public health at the University of California, Berkeley. “From an evolutionary perspective, in stressful eras it’s a smarter bet to have a female child than a male child. A daughter is more apt to provide you with grandchildren,” Catalano tells me. In hard times, he explains, weak males are less likely to survive and to rep...Folksonomies: pregnancy fetal development
Folksonomies: pregnancy fetal development
1 notes
notesIt makes sense evolutionarily to have females during times of stress as males are less likely to survive.
19 MAY 2011 by ideonexus
Guppies Evolve Their Spots in Experimentation
Guppies are popular freshwater aquarium fish. As with the pheasants we met in Chapter 3,
the males are more brightly coloured than the females, and aquarists have bred them to become
even brighter. Endler studied wild guppies (Poecilia reticulata) living in mountain streams in
Trinidad, Tobago and Venezuela. He noticed that local populations were strikingly different from
each other. In some populations the adult males were rainbow-coloured, almost as bright as those
bred in aquarium tanks. H...Folksonomies: evolution experimentation
Folksonomies: evolution experimentation
1 Spots are attractive to females, but also attractive to predators.
04 MAY 2011 by ideonexus
Humans are a Self-Domesticated Animal
Mankind is a self-domesticated animal; a mammal; an ape; a social ape; an ape in which the male takes the initiative in courtship and females usually leave the society of their birth; an ape in which men are predators, women herbivorous foragers; an ape in which males are relatively hierarchical, females relatively egalitarian; an ape in which males contribute unusually large amounts of investment in the upbringing of their offspring by provisioning their mates and their children with food, p...A list of the behaviors in human beings.
04 MAY 2011 by ideonexus
Human Pairs Must Keep Each Other Interested
Likewise, the manner in which sexual selection capriciously seizes upon preexisting perceptual biases fits with the fact that apes are by nature naturally "curious, playful, easily bored, and appreciative of simulation." Miller suggests that to keep a husbanc around long enough to help in raising children, women would have needed to be as varied and creative in their behavior as possible, which he calls the Scheherazade effect after the Arabian storyteller who entranced the Sultan with 1,001 ... 1 notes
notesMen and women in marriage seek to keep each other entertained to retain interest.
03 MAY 2011 by ideonexus
If Humans Were Like Chimpanzees
If we were hairless chimpanzees, our society would still Dok fairly familiar in some ways. We would live in families, be very social, hierarchical, group-territorial, and aggressive toward other groups than those we belong to. In other words, we would be family-based, urban, class-conscious, nationalist, and belligerent, which we are. Adult males would spend more time trying to climb the political hierarchy than with their families. But when we turn to sex, things would begin to look very dif...Much would be the same, but we would be very different sexually.
