Directional and fluctuating asymmetry in finger and a-b ridge counts in psychosis: a case-control study

Saha, Sukanta; Loesch, Danuta Z.; Chant, David; Welham, Joy; El-Saadi, O.; Fañanás, Lourdes; Mowry, Bryan; McGrath, John

doi:10.1186/1471-244x-3-3

Cited by 37 publications

(26 citation statements)

References 41 publications

(66 reference statements)

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“…Minor directional asymmetry is present in some of the palmar and finger ridge counts [82,83,96]. Moreover, males have about 21 more ridges, on average, than females [45], though the effect size is small (Cohen's d = 0.36).…”

Section: Dermatoglyphic Asymmetrymentioning

confidence: 99%

“…Palmer and Strobeck [8], in an influential paper, concluded that the correlation of R on L behaves differently from all other indices and never achieves their statistical power. Nevertheless, both the correlation coefficient and coefficient of indetermination were still in wide use five years ago, especially by those studying human dermatoglyphic asymmetry (see [40,95,96,99]). …”

Section: Dermatoglyphic Asymmetrymentioning

confidence: 99%

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Fluctuating Asymmetry of Human Populations: A Review

Graham

Özener

2016

Symmetry

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Fluctuating asymmetry, the random deviation from perfect symmetry, is a widely used population-level index of developmental instability, developmental noise, and robustness. It reflects a population's state of adaptation and genomic coadaptation. Here, we review the literature on fluctuating asymmetry of human populations. The most widely used bilateral traits include skeletal, dental, and facial dimensions; dermatoglyphic patterns and ridge counts; and facial shape. Each trait has its advantages and disadvantages, but results are most robust when multiple traits are combined into a composite index of fluctuating asymmetry (CFA). Both environmental (diet, climate, toxins) and genetic (aneuploidy, heterozygosity, inbreeding) stressors have been linked to population-level variation in fluctuating asymmetry. In general, these stressors increase average fluctuating asymmetry. Nevertheless, there have been many conflicting results, in part because (1) fluctuating asymmetry is a weak signal in a sea of noise; and (2) studies of human fluctuating asymmetry have not always followed best practices. The most serious concerns are insensitive asymmetry indices (correlation coefficient and coefficient of indetermination), inappropriate size scaling, unrecognized mixture distributions, inappropriate corrections for directional asymmetry, failure to use composite indices, and inattention to measurement error. Consequently, it is often difficult (or impossible) to compare results across traits, and across studies.

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Section: Dermatoglyphic Asymmetrymentioning

confidence: 99%

Section: Dermatoglyphic Asymmetrymentioning

confidence: 99%

Fluctuating Asymmetry of Human Populations: A Review

Graham

Özener

2016

Symmetry

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“…Fluctuating asymmetry, for example, is associated with male, but not female, sexual orientation [325]. Moreover, it is positively associated with schizophrenia [326,327], human reactive aggression [328], and attention-deficit hyperactivity disorder [329,330], but is unrelated to psychosis [331].…”

Section: Anthropology and Evolutionary Psychologymentioning

confidence: 99%

Fluctuating Asymmetry: Methods, Theory, and Applications

et al. 2010

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Fluctuating asymmetry consists of random deviations from perfect symmetry in populations of organisms. It is a measure of developmental noise, which reflects a population's average state of adaptation and coadaptation. Moreover, it increases under both environmental and genetic stress, though responses are often inconsistent. Researchers base studies of fluctuating asymmetry upon deviations from bilateral, radial, rotational, dihedral, translational, helical, and fractal symmetries. Here, we review old and new methods of measuring fluctuating asymmetry, including measures of dispersion, landmark methods for shape asymmetry, and continuous symmetry measures. We also review the theory, developmental origins, and applications of fluctuating asymmetry, and attempt to explain conflicting results. In the process, we present examples from the literature, and from our own research at "Evolution Canyon" and elsewhere.

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“…For instance, for TFRC, the differences between patient and control groups have been found to be both statistically significant 1,6 and statistically insignificant. 9,10,27,29,30 Inconsistent results have also been obtained for AB-TRC.…”

Section: Determining the Association Between Dermatoglyphics And Schimentioning

confidence: 52%

Determining the Association Between Dermatoglyphics and Schizophrenia by Using Fingerprint Asymmetry Measures

Wang

Lin

Yen

et al. 2008

Int. J. Patt. Recogn. Artif. Intell.

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Early detection and intervention strategies for schizophrenia are receiving increasingly more attention. Dermatoglyphic patterns, such as the degree of asymmetry of the fingerprints, have been hypothesized to be indirect measures for early abnormal developmental processes that can lead to later psychiatric disorders such as schizophrenia. However, previous results have been inconsistent in trying to establish the association between dermatoglyphics and schizophrenia. The goal of this work is to try to resolve this problem by borrowing well-developed techniques from the field of fingerprint matching. Two dermatoglyphic asymmetry measures are proposed that draw on the orientation field of homologous fingers. To test the capability of these measures, fingerprint images were acquired digitally from 40 schizophrenic patients and 51 normal individuals. Based on these images, no statistically significant association between conventional dermatoglyphic asymmetry measures and schizophrenia was found. In contrast, the sample means of the proposed measures consistently identified the patient group as having a higher degree of asymmetry than the control group. These results suggest that the proposed measures are promising for detecting the dermatoglyphic patterns that can differentiate the patient and control groups.

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Directional and fluctuating asymmetry in finger and a-b ridge counts in psychosis: a case-control study

Cited by 37 publications

References 41 publications

Fluctuating Asymmetry of Human Populations: A Review

Fluctuating Asymmetry of Human Populations: A Review

Fluctuating Asymmetry: Methods, Theory, and Applications

Determining the Association Between Dermatoglyphics and Schizophrenia by Using Fingerprint Asymmetry Measures

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