----- Forwarded message from Miguel Eduardo Delgado Burbano -----
Date: Wed, 18 Jun 2014 17:33:56 -0400
From: Miguel Eduardo Delgado Burbano
Reply-To: Miguel Eduardo Delgado Burbano
Subject: Re: landmark configuration reflection
To: [email protected]
Dear Gred
Of course this is not for publication only to simulate data and evaluate
differences within a alleged perfect left-side right-side symmetry. However
actually human faces are basically symmetric and any deviation of symmetry is
caused by developing noise (i.e. fluctuating asymmetry). Any way your r-script
is useful in my case to simulate and compare data.
best
Miguel
On Wed, Jun 18, 2014 at 1:55 AM, wrote:
----- Forwarded message from GREG CAMPBELL -----
Date: Tue, 10 Jun 2014 04:50:44 -0400
From: GREG CAMPBELL
Reply-To: GREG CAMPBELL
Subject: Re: landmark configuration reflection
To: "[email protected]"
Dear Miguel: You cannot reflect your points. Human faces are not symmetric (a
quick search in Google Scholar or PubMed will show this). I think I recall
that there is less sexual selection for symmetry in human males, but strong
sexual selection for symmetry in human females. The sexual selection is never
strong enough to produce exact symmetry in individuals.
Anybody reviewing your paper for publication would immediately suspect your
results, if you just mirror your landmarks. Either stick to left sides, or
digitize both sides and examine the extent and direction of assymetry with
genetic diversity, or between males/females.
Greg Campbel
The Naive Chemist
-------------------------
From: "[email protected]"
To: [email protected]
Sent: Tuesday, 10 June 2014, 8:43
Subject: landmark configuration reflection
----- Forwarded message from Miguel Eduardo Delgado Burbano -----
Date: Thu, 5 Jun 2014 17:59:15 -0300
From: Miguel Eduardo Delgado Burbano
Reply-To: Miguel Eduardo Delgado Burbano
Subject: landmark configuration reflection
To: [email protected]
Hi all
I am performing a 2D geometric morphometric study using human skulls. In a
previous research I digitized several landmarks and semilandmarks in the right
half of the face, but now I am trying to perform an analysis using the complete
face (i.e both halfs), so in order to not digitized again perhaps I can reflect
the right landmark configuration on the left side. Since the reflection is
performed during the procrustes (GPA) perhaps a particular software allows to
reflect the landmark configuration TPS, MorphoJ, GeoMorph etc??
any suggestions?
thank you in advance
best
Miguel
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