scholarly journals Are human preferences for facial symmetry focused on signals of developmental instability?

2004 ◽  
Vol 15 (5) ◽  
pp. 864-871 ◽  
Author(s):  
Leigh W. Simmons ◽  
Gillian Rhodes ◽  
Marianne Peters ◽  
Nicole Koehler
Keyword(s):  
Developmental Instability ◽  
Facial Symmetry

scholarly journals Fluctuating Asymmetry and Developmental Instability, a Guide to Best Practice

Symmetry ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 9
Author(s):  
John H. Graham
Keyword(s):  
Measurement Error ◽  
Best Practices ◽  
Environmental Stress ◽  
Fluctuating Asymmetry ◽  
Best Practice ◽  
Developmental Instability ◽  
The Past ◽  
Size Scaling ◽  
Research Designs

Best practices in studies of developmental instability, as measured by fluctuating asymmetry, have developed over the past 60 years. Unfortunately, they are haphazardly applied in many of the papers submitted for review. Most often, research designs suffer from lack of randomization, inadequate replication, poor attention to size scaling, lack of attention to measurement error, and unrecognized mixtures of additive and multiplicative errors. Here, I summarize a set of best practices, especially in studies that examine the effects of environmental stress on fluctuating asymmetry.

scholarly journals Nature, Nurture, and Noise: Developmental Instability, Fluctuating Asymmetry, and the Causes of Phenotypic Variation

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1204
Author(s):  
John H. Graham
Keyword(s):  
Fluctuating Asymmetry ◽  
Phenotypic Variation ◽  
Deterministic Chaos ◽  
Monozygotic Twins ◽  
Developmental Instability ◽  
Nonlinear Feedback ◽  
Developmental Variation ◽  
Sewall Wright ◽  
Developmental Noise ◽  
And Behavior

Phenotypic variation arises from genetic and environmental variation, as well as random aspects of development. The genetic (nature) and environmental (nurture) components of this variation have been appreciated since at least 1900. The random developmental component (noise) has taken longer for quantitative geneticists to appreciate. Here, I sketch the historical development of the concepts of random developmental noise and developmental instability, and its quantification via fluctuating asymmetry. The unsung pioneers in this story are Hugo DeVries (fluctuating variation, 1909), C. H. Danforth (random variation between monozygotic twins, 1919), and Sewall Wright (random developmental variation in piebald guinea pigs, 1920). The first pioneering study of fluctuating asymmetry, by Sumner and Huestis in 1921, is seldom mentioned, possibly because it failed to connect the observed random asymmetry with random developmental variation. This early work was then synthesized by Boris Astaurov in 1930 and Wilhelm Ludwig in 1932, and then popularized by Drosophila geneticists beginning with Kenneth Mather in 1953. Population phenogeneticists are still trying to understand the origins and behavior of random developmental variation. Some of the developmental noise represents true stochastic behavior of molecules and cells, while some represents deterministic chaos, nonlinear feedback, and symmetry breaking.

Contralateral botulinum injections improve drinking ability and facial symmetry in patients with facial paralysis

2005 ◽  
Vol 139 (3) ◽  
pp. 540 ◽  
Author(s):  
Gregory B. Krohel ◽  
Cheryl L. Cipollo ◽  
Krishna Gaddipati
Keyword(s):  
Facial Paralysis ◽  
Facial Symmetry

Developmental instability and plant potential fitness in a Mediterranean perennial plant, Retama sphaerocarpa (L.) Boiss

2005 ◽  
Vol 27 (1) ◽  
pp. 43-48 ◽  
Author(s):  
S.G. Fungairiño ◽  
C. Fernández ◽  
J.M. Serrano ◽  
F. López ◽  
F.J. Acosta
Keyword(s):  
Developmental Instability ◽  
Retama Sphaerocarpa ◽  
Perennial Plant
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