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Author Topic:   "Slanted" Eyes in Orientals
RAZD
Member (Idle past 1423 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 16 of 97 (100967)
04-19-2004 3:48 PM
Reply to: Message 15 by Parsimonious_Razor
04-19-2004 1:23 PM


Re: Natural and Sexual Selection
I think we are arguing two facets of the same view, with perhaps a slight divergence on the relative importances of the different mechanisms.
I do think one needs to be a little careful on the "Most people find traits that belong to individuals they are around a lot more attractive than traits of individuals they do not see often" versus attraction to novelty. Attraction to novelty also manifests as interest in art etc.
Some novelty is desirable in a mate, too much is not. This would be a measure of compatability between gene sets while ensuring enough protection from {incest \ inbreeding}. All else being equal eye shape has novelty.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
 Message 15 by Parsimonious_Razor, posted 04-19-2004 1:23 PM Parsimonious_Razor has replied

Replies to this message:
 Message 17 by Parsimonious_Razor, posted 04-19-2004 4:59 PM RAZD has replied

  
Parsimonious_Razor
Inactive Member


Message 17 of 97 (100982)
04-19-2004 4:59 PM
Reply to: Message 16 by RAZD
04-19-2004 3:48 PM


Re: Natural and Sexual Selection
Probably pretty close to splitting hairs. The limits to the attraction of novelty is based on species typical designs and high pheno/genotypic quality. You won't find six eyes attractive or a highly testoteronized face attractive on a female no matter where you have been raised. But there is an almost infinite subtly in the way a face can be put together with in these boundaries. Slanted eyes/open eyes being one example. If there is no adaptive benefit or signaling effect it becomes very difficult to argue for ANY selection pressure natural or sexual.
The main point I was making about changes in how attractive you find new feature with in the boundaries as a function of how long you have been around them is that any of these traits fall naturally under the human spectrum of "attractive" and its just getting used to them. I can't remember the study off the top of my head, I will look for it. That looked at how attractiveness ratings for various facial features changed compared to frequency of exposure to the traits. If these traits are already with in the radar of human attractiveness then they are purely a historical accident as was said early on but not in terms of sexual selection. I don't think there is ANY selection going on here, but I could be proved wrong if someone had some more concrete data on what kind of signal could be being displayed here.

This message is a reply to:
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Replies to this message:
 Message 18 by RAZD, posted 04-19-2004 5:06 PM Parsimonious_Razor has replied

  
RAZD
Member (Idle past 1423 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 18 of 97 (100984)
04-19-2004 5:06 PM
Reply to: Message 17 by Parsimonious_Razor
04-19-2004 4:59 PM


Re: Natural and Sexual Selection
I would be interested in the study
I just went through
Department of Psychology | The University of New Mexico
and am still digesting some of it.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
 Message 17 by Parsimonious_Razor, posted 04-19-2004 4:59 PM Parsimonious_Razor has replied

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Parsimonious_Razor
Inactive Member


Message 19 of 97 (101091)
04-20-2004 1:05 AM
Reply to: Message 18 by RAZD
04-19-2004 5:06 PM


Re: Natural and Sexual Selection
I will work on it tomarrow. Dr. Miller has done some interesting work, I took a course from him last semester and liked his theory quiet a bit. I think it lacks a certain falsifiablity for the moment, and personally have a tendancy to lean towards a slightly diffrent version of human intelligence (more in line with Randy Thornhill also at UNM).
But I will try and post the article info tomarrow.

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Parsimonious_Razor
Inactive Member


Message 20 of 97 (101420)
04-21-2004 1:33 AM
Reply to: Message 19 by Parsimonious_Razor
04-20-2004 1:05 AM


Re: Natural and Sexual Selection
Okay the big tour de force for the commonality of what constitutes facial attractivness was:
Michael R. Cunningham, Alan R. Roberts,Anita P. Barbee,Perri B. Druen, Cheng-Huan Wu "Their Ideas of Beauty Are, on the Whole, the Same as Ours: Consistency and Variability in the Cross-Cultural Perception of Female Physical Attractiveness " Journal of Personality and Social Psychology. Vol. 68 (2) February 1995, pp. 261-279. American Psychological Association
I thought this study also showed that exposure to faces of diffrent races increased attractivness ratings, I was wroung. That information actually when I started e-mailing around was something I must have picked up in my conversations with on of my advisors. He said it was ancedotal but talked about but he couldn't think of a specific study. So I this is what I got. Sorry about that.
I don't think that mix up harms my point that facial attractivness as a sexually selected signal stays pretty constant across cultures and that minor variations are insignificant and probably totally accidental and not under direct selection of any type.

This message is a reply to:
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RAZD
Member (Idle past 1423 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 21 of 97 (101555)
04-21-2004 12:08 PM
Reply to: Message 20 by Parsimonious_Razor
04-21-2004 1:33 AM


Re: Natural and Sexual Selection
There was also an (cover story) article in discover mag a while back about beauty -- the cover was a pastiche of pictures to arrive at an "ideal" beauty. If you are interested I will look for it.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
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Asgara
Member (Idle past 2321 days)
Posts: 1783
From: Wisconsin, USA
Joined: 05-10-2003


Message 22 of 97 (101559)
04-21-2004 12:27 PM
Reply to: Message 21 by RAZD
04-21-2004 12:08 PM


Re: Natural and Sexual Selection
I believe the consensus was that symmetry was what was looked for. Though people seem to be wired to find thier own ethnic type more attractive than others, when faced with pictures of individuals outside their ethnic group all tended to rate the same pictures as attractive. When symmetry of the face was measured there seemed to be a correlation between greater symmetry and higher attractiveness ratings.

Asgara
"Embrace the pain, spank your inner moppet, whatever....but get over it"

This message is a reply to:
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Dr Jack
Member
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003
Member Rating: 8.3


Message 23 of 97 (101562)
04-21-2004 12:30 PM
Reply to: Message 22 by Asgara
04-21-2004 12:27 PM


Re: Natural and Sexual Selection
ALL studies on mate attraction, regardless of whether on humans, have found symmetry to be significant factor. Also, women report better orgasms with more symmetrical partners (and I don't just mean down there). Finally, IIRC, the most attractively rated people are composites outside of the range of actual racial variation - i.e. caucasion/oriental crosses.

This message is a reply to:
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Parsimonious_Razor
Inactive Member


Message 24 of 97 (101568)
04-21-2004 1:26 PM


In honest signaling you can take several approaches to it, the first is large exaggerated and costly signals that signify your general good health and ability to invest in such a gaudy display. The second is to try and recreate a very refined average. I have always found this analogous to say the difference between mocking bird mate calls and whale mate calls. The mocking bird trains very hard to have novel and loud and impressive calls, while the whale works very hard to try and replicate precisely songs that can be 4-6 hours long. Females choose either on gaudy display or the accuracy of replication. Facial attractiveness seems to be the latter type of signaling. The average of any amount of faces will always be the most attractive.
Symmetry is very important and probably one of the greatest signals but another VERY important part of facial attractiveness is secondary hormone markers. For women the face needs to be highly estrgonized and in men it needs to be highly testosteronized (this is a bit of a misnomer since an estrognized face is a face that has not be testosteronized, since high estrogen to testosterone ratio prevents structural changes testosterone makes after puberty). Also factors such as neotany and senesance plays a role. The study I quoted above gives half a dozen or so important criteria.
People do have a tendency to rank those of their same ethnic background as more attractive than other ethnic backgrounds. But when they rank the relative attractiveness of people in other ethnic backgrounds it correlates like r>.9 with the within ethnic ranks. Also there is talk that maybe exposure to novel ethnic traits over time will increase the relative attractiveness rankings. But I again I don't think this has been systematically studied.

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RAZD
Member (Idle past 1423 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 25 of 97 (101621)
04-21-2004 5:32 PM
Reply to: Message 24 by Parsimonious_Razor
04-21-2004 1:26 PM


From the Feb 2000 Discover article (Discover Financial Services)
{{you need to sign in to get full articles now}}
Human beings may be born "cognitive averagers," theorizes Langlois. "Even very young infants have seen thousands of faces and may have already constructed an average from them that they use for comparison."
Inclination toward the average is called koinophilia, from the Greek words koinos, meaning "usual," and philos, meaning "love."
But koinophilia isn't the only-or even supreme-criterion for beauty that evolution has promoted, other scientists argue. An innate yearning for symmetry is a major boon, contend biologists Anders Moller and Randy Thornhill, as asymmetry can signal malnutrition, disease, or bad genes. The two have found that asymmetrical animals, ranging from barn swallows to lions, have fewer offspring and shorter lives.
"It turned out that the way an attractive female face differs from an average one is related to femininity," says Perrett. "For example, female eyebrows are more arched than males'. Exaggerating that difference from the average increases femininity," and, in tandem, the attractiveness rating. In the traffic-stopping female face created for this experiment, 200 facial reference points all changed in the direction of hyperfemininity: larger eyes, a smaller nose, plumper lips, a narrower jaw, and a smaller chin.
"All faces go through a metamorphosis at puberty," observes Johnston. "In males, testosterone lengthens the jaw. In females, estrogen makes the hips, breasts, and lips swell." So large lips, breasts, and hips combined with a small jaw "are all telling you that I have an abundant supply of estrogen, so I am a fertile female." Like the peacock, whose huge tail is a mating advantage but a practical hindrance, "a small jaw may not, in fact, be as efficient for eating," Johnston says.
If each person is constructing their personal average from their experience then exposure to more "foreign" faces for extended time periods would probably show a drift in the 'average' value. I would also expect recent experience to carry more weight than past.
Pictures not loading on the article one is a computer evolved face from 16 at start and subsequent generations made from the top picks.
almond eyes, but no fold (also not in the original samples, so biased results).

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

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macaroniandcheese 
Suspended Member (Idle past 3946 days)
Posts: 4258
Joined: 05-24-2004


Message 26 of 97 (115847)
06-16-2004 6:09 PM
Reply to: Message 12 by RAZD
04-19-2004 1:19 AM


Re: Natural and Sexual Selection
not true. a sexual preference for a trait that endangers survival will ensure the survival of only the strongest members... those who can survive in spite of a purposeful handicap. that's why birds sexually select for big tails and pretty bowers (thatch housey things... see bower birds). it takes a lot of work to survive while sporting a long, heavy tail or trying to build a fabulous bower. so that particular specimen (potential mate) is more likely to be strong, have good eyesight (bowers generally include differently colored items sorted by color), and be especially clever to elude predators and rivals.
there are lots of examples of this. but birds are the most common.
also that weird playful jumping that antelope do in africa is a similar handicap technique. it has nothing to do with sexual selection, but it can dissuade a lion from attacking. it says 'hey look, i can hop around like an idiot and give you a headstart on catching me and yet, STILL outrun you... so why don't you save us both the effort". and it works.. because the antelope must be able to back it up, or he dies.

This message is a reply to:
 Message 12 by RAZD, posted 04-19-2004 1:19 AM RAZD has replied

Replies to this message:
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macaroniandcheese 
Suspended Member (Idle past 3946 days)
Posts: 4258
Joined: 05-24-2004


Message 27 of 97 (115849)
06-16-2004 6:12 PM
Reply to: Message 22 by Asgara
04-21-2004 12:27 PM


Re: Natural and Sexual Selection
people also look for (subconsciously) similar proportions of extremities, and (funnily enough) proportionally identical earlobe length. people are weird.

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RAZD
Member (Idle past 1423 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 28 of 97 (115875)
06-16-2004 8:58 PM
Reply to: Message 26 by macaroniandcheese
06-16-2004 6:09 PM


Re: Natural and Sexual Selection
a trait that endangers survival will ensure the survival of only the strongest members...
I may have overstated the case, but lets not go overboard the other direction. Nothing ensures survival, and such extreme sexual selection pressure will mean that both survival and sexual selection will place extra pressure on the individuals. As a birder I am aware of the many examples of extreme sexual selection, some of them on the verge of extinction.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
 Message 26 by macaroniandcheese, posted 06-16-2004 6:09 PM macaroniandcheese has replied

Replies to this message:
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macaroniandcheese 
Suspended Member (Idle past 3946 days)
Posts: 4258
Joined: 05-24-2004


Message 29 of 97 (115882)
06-16-2004 9:22 PM
Reply to: Message 28 by RAZD
06-16-2004 8:58 PM


Re: Natural and Sexual Selection
um. i qualified that.
ensure the survival of only the strongest
i meant that it ensures the strength of the survivors not that anyone will survive necessarily. the idea is to kill off the weak ones. those not strong enough to carry their tails or smart/quick enough to evade predators when their ridiculous displays call attention to them will be culled. the rest... on with the booty.

This message is a reply to:
 Message 28 by RAZD, posted 06-16-2004 8:58 PM RAZD has replied

Replies to this message:
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RAZD
Member (Idle past 1423 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 30 of 97 (115903)
06-16-2004 10:55 PM
Reply to: Message 29 by macaroniandcheese
06-16-2004 9:22 PM


Re: Natural and Sexual Selection
we come closer.
putting extra survival pressure on potential mates through sexual selection means that those that are able to survive to mate will be the strongest and healthiest of the available choices. whether that is sufficient to ensure species survival is the question.
my feeling is that in the long term it is self (species) defeating compared to more generalist species.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
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Replies to this message:
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 Message 33 by pink sasquatch, posted 06-17-2004 9:53 AM RAZD has replied

  
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