Talk:Digit ratio

Mathematical explanation

I think it would be nice to include a plot explaining the alternative explanation - a mathematical artifact of using ratio instead of a line described by slope and intercept to model the data. Not sure if I can upload an image.. http://imgur.com/K4doEjJ

File:Ratio of points on line with non-zero intercept.gif

Ratio of points (violet) sampled from a line with non-zero intercept (blue) approaches the slope of the line (golden) as x increases.

Large commented ref section moved here

I'm moving this here for page size/visibility reasons... Hiding old reference section. Needs to be checked, but everything should be in footnotes now, and in a much more verifiable format.

Some more citations to be added to this page

This archive has a long list of academic papers on the Digit Ratio ttps://archive.fo/QFYJQ

Correlation between Child Sex Offenders and Lower Digit Ratio https://doi.org/10.1038/s41398-018-0326-0 

Correlation with Autism (Low Digit Ratio) - https://doi.org/10.1038/s41398-018-0186-7 - http://oaktrust.library.tamu.edu/bitstream/handle/1969.1/153992/SAENZ-DISSERTATION-2014.pdf?sequence=1 - https://docs.autismresearchcentre.com/papers/2005_Knickmeyer_PhD_Prenatal-testosterone-and-autism.pdf - http://doi.org/10.1098/rspb.2019.1062 - https://doi.org/10.1348/000712608X311731

Correlation with ADHD (Low Digit Ratio) - https://doi.org/10.1111/j.1469-8749.2006.tb01266.x - https://doi.org/10.30773/pi.2020.0003

Correlation with High-Functioning Autism (High Digit Ratio) 10.1023/A:1014091420590

Correlation with Psychotic Spectrum Risk (High Digit Ratio) - https://doi.org/10.1590/1516-4446-2019-0836 - https://doi.org/10.1177/0300060520929148 - https://openarchive.ki.se/xmlui/bitstream/handle/10616/41207/Thesis\_Anette\_Johansson.pdf?sequence=5&isAllowed=y

Correlation with Lower rates of suicide and respiratory disease (High Digit Ratio) https://doi.org/10.1007/s00702-017-1815-7

Correlation with desire for Short Term Relationship (Low Digit Ratio) https://doi.org/10.1007/s10508-010-9698-9

Correlation with "Butch Lesbianism" and "Tomboy" Tendencies (Low Digit Ratio) - https://doi.org/10.1016/0031-9384(96)00132-1 - https://doi.org/10.1023/A:1014091420590 - https://doi.org/10.1016/j.psyneuen.2017.01.032 - https://doi.org/10.1016/s0301-0511(02)00127-8

Correlation with Preference of Feminism (Low Digit Ratio) - https://doi.org/10.3389/fpsyg.2014.01011

Correlation with GD (High Digit Ratio for men, Low Digit Ratio for women) - https://doi.org/10.1007/s10508-020-01630-0 - https://doi.org/10.1038/s41598-020-72486-6 - https://doi.org/10.2307/40065044

More Information

Lower Digit Ratio

• Short Term Relationships https://doi.org/10.1007/s10508-010-9698-9
• Belief in Feminism in Females https://doi.org/10.3389/fpsyg.2014.01011
• Spacial Reasoning - https://doi.org/10.1371/journal.pone.0032816 https://doi.org/10.1007/978-3-642-02767-3_30
• Higher Likelihood of Attractiveness Jealousy in Females https://martijnwieling.nl/files/2d4d.pdf
• Self-serving behavior https://www.sciencedirect.com/science/article/abs/pii/S0191886909001214?via%3Dihub
• Female Happiness, Materialism for Mixed-Sex Conflict rather than Mating Effort https://doi.org/10.1002/mar.21295
• Rules Violation https://www.frontiersin.org/articles/10.3389/fnbeh.2017.00254/full
• Aggression, and Preference in Sports https://www.sciencedirect.com/science/article/abs/pii/S0191886917302714
• Youth Athleticism https://www.atlantis-press.com/proceedings/mse-17/25884024
• Athleticism https://www.sciencedaily.com/releases/2017/08/170817201218.htm
• Crossfit Preference https://fau.digital.flvc.org/islandora/object/fau%3A41292/datastream/OBJ/view/2D_4D_FINGER_RATIO_IN_CROSSFIT_ATHLETES.pdf
• Indicator of Male Facial Attractiveness https://www.jstor.org/stable/41315108
• Risk of being a Child Sex Offender https://www.nature.com/articles/s41398-018-0326-0

Higher Digit Ratio

• Higher Life Expectancy and Lower Rates of Suicide https://d-nb.info/1155838009/34
• Higher Likelihood of Dominance Jealousy in Men https://martijnwieling.nl/files/2d4d.pdf
• Lower Waist to Hip Ratio https://www.nature.com/articles/0803154.pdf
• Higher Chest Circumference https://doi.org/10.1080/03014460310001620153
• Mating Frugality http://influencia.unb.br/wp-content/uploads/2017/02/Nepomuceno-Saad-Stenstrom-Mendenhall-Iglesias-Testosterone-at-your-fingertips-Digit-ratios-2D-4D-and-rel-2-as-predictors-of-courtship-related-consumption-intended-to-acquire-and-retain-mates.pdf
• High Functioning Autism (when separated as a separate category) https://doi.org/10.1023/A:1014091420590

Clarification: Autism Spectrum and Psychotic Spectrum Misdiagnosis Risk

Observing the articles below, it is safe to note that "High-Functioning Autism" can be a misclass of Developmental Psychosis.

• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6393379
• http://ethosnews.com/2017/10/10/autism-or-schizophrenia-a-common-misdiagnosis/
• https://doi.org/10.1371/journal.pone.012271
• https://www.cambridge.org/core/journals/bjpsych-advances/article/autism-spectrum-disorder-and-schizophrenia-boundaries-and-uncertainties/A038239D14B3462832B5576D4B57E1B0
• https://www.theneurotypical.com/schizophrenia-and-asd.html
• https://primate.uchicago.edu/2014EHB.pdf
• https://www.pnas.org/content/107/suppl_1/1736
• https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/ejn.13599
• https://jneuroinflammation.biomedcentral.com/track/pdf/10.1186/s12974-017-0938-y.pdf
• https://onlinelibrary.wiley.com/doi/10.1111/jcap.12145

This distinction of course is related to https://en.wikipedia.org/wiki/Imprinted_brain_hypothesis and https://en.wikipedia.org/wiki/Talk:Imprinted_brain_hypothesis

• https://www.psychologytoday.com/us/blog/the-imprinted-brain/202101/mitochondria-missing-pieces-in-imprinted-brain-epigenetics
• https://www.psychologytoday.com/us/blog/the-imprinted-brain/201901/the-imprinted-brain-theory-in-thousand-words
• https://link.springer.com/article/10.1007/s40750-018-0103-6
• https://onlinelibrary.wiley.com/doi/pdf/10.1111/eva.13244

Aspergers having higher Digit Ratio than people with mainline Autism https://pubmed.ncbi.nlm.nih.gov/11263685

Dyslexia vs Specific Language Impairment

Higher Digit Ratio Correlated to SLI (Reading Comprehension or Aphasia)

• https://www.sciencedirect.com/science/article/pii/S234128791830173X
• https://indianmentalhealth.com/pdf/2019/vol6-issue4/Original_Research_Paper3_8.pdf

Lower Digit Ratio Correlated to Dyslexia

• https://www.ncbi.nlm.nih.gov/pubmed/17712280
• https://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC5945080&blobtype=pdf

Counter Against Lower Digit Ratio Correlated to Dyslexia

• https://pubmed.ncbi.nlm.nih.gov/17712280/
• https://www.cambridge.org/core/journals/developmental-medicine-and-child-neurology/article/abs/second-to-fourth-digit-ratio-and-dyslexia-no-evidence-for-an-association-between-reading-disabilities-and-the-2d4d-ratio/91539FE6FB0E38D8DA2034115DD55CB8

Relations to Geschwind–Galaburda hypothesis and Left-Handedness

Observing the hypothesis, one can claim that gender non-conformity, "deviance", left-handedness, intelligence, reading disabilities, and higher digit ratios.

• https://www.wikiwand.com/en/Geschwind%E2%80%93Galaburda_hypothesis
• https://dss.ncf.edu/class/cornel/HUMN3200/?p=109
• https://dss.ncf.edu/class/cornel/HUMN3200/?p=121
• https://dss.ncf.edu/class/cornel/HUMN3200/?p=139

With Relation to Intelligence (similar to those with higher digit ratios):

• https://pubmed.ncbi.nlm.nih.gov/679711/
• https://pubmed.ncbi.nlm.nih.gov/3243676/

With Relation to Sex Roles (similar to those with high digit ratio):

• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5325203/
• https://doi.org/10.1007/s10508-018-1346-9

With Relation to Schizophrenia (similar to those with high digit ratio):

• https://www.cambridge.org/core/journals/the-british-journal-of-psychiatry/article/excess-of-nonrighthandedness-in-schizophrenia-metaanalysis-of-gender-effects-and-potential-biases-in-handedness-assessment/7ADBB4D42B81AC22AF4322ACBC07065D

Relation with Sport

I am taking a note here that there are scientific articles that shows the link between digit ratio and sport. We need to add to this article. 60.242.13.83 (talk) 22:23, 24 November 2023 (UTC)

Relation with Sport

I am taking a note here that there are scientific articles that shows the link between digit ratio and sport. We need to add to this article. Wisnuops (talk) 22:25, 24 November 2023 (UTC)