Prenatal Androgen and Skills
30 de maio de 2026 atualizado por: Rabia ZORLULAR, Nigde Omer Halisdemir University
Prenatal Androgen and Fine Motor Skills and Tactile Discrimination
Due to the difficulties and risks of directly measuring prenatal hormone levels, biomarkers that indirectly reflect this exposure are used in research.
In this context, the ratio of second to fourth finger length (2D:4D) is widely preferred because it is an easily applicable and non-invasive measurement.
Evidence shows that 2D:4D stabilizes from the second trimester of pregnancy onward and exhibits strong sex differences across populations.
The 2D:4D ratio is generally lower in men than in women.
2D is more strongly influenced by prenatal estrogen, while 4D is more strongly influenced by prenatal testosterone; this occurs during the first trimester of intrauterine fetal development.
To our knowledge, studies examining the relationship between the 2D:4D ratio, an indirect indicator of prenatal androgen exposure, and dexterity and tactile discrimination are limited.
Accordingly, the planned study aims to evaluate the relationship between the 2D:4D ratio and fine motor skills and tactile discrimination in healthy young adults.
Visão geral do estudo
Status
Inscrevendo-se por convite
Condições
Intervenção / Tratamento
Descrição detalhada
Sex hormones experienced during prenatal exposure play a significant role in shaping certain lifelong characteristics by influencing both the physical and neurological development of individuals.
The effects of these hormones, particularly on the developing nervous system, contribute to the emergence of behavioral and functional differences.
Hand preference and certain behavioral traits in humans have been shown to be related to prenatal hormonal exposure.
However, the development of these traits is not limited to hormonal influences alone, but is shaped by the interaction of genetic, environmental, and sociocultural factors.
Due to the difficulties and risks of directly measuring prenatal hormone levels, biomarkers that indirectly reflect this exposure are used in research.
In this context, the ratio of second to fourth finger length (2D:4D) is widely preferred because it is an easily applicable and non-invasive measurement.
The 2D:4D ratio is generally lower in men than in women.
2D is more strongly influenced by prenatal estrogen, while 4D is more strongly influenced by prenatal testosterone; this occurs during the first trimester of intrauterine fetal development.
However, whether the 2D:4D ratio is a reliable indicator of prenatal hormonal exposure is still a controversial issue in the literature.
Therefore, examining the relationship between the 2D:4D ratio and various biological and functional characteristics remains important.
To our knowledge, studies examining the relationship between the 2D:4D ratio, an indirect indicator of prenatal androgen exposure, and dexterity and tactile discrimination are limited.
Accordingly, the planned study aims to evaluate the relationship between the 2D:4D ratio and fine motor skills and tactile discrimination in healthy young adults.
It is hypothesized that prenatal hormonal exposure may indirectly shape finger morphology and receptor distribution by affecting skin and nervous system development, which may be a determining factor in tactile sensitivity and dexterity.
Tipo de estudo
Observacional
Inscrição (Estimado)
94
Contactos e Locais
Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.
Locais de estudo
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Merkez
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Niğde, Merkez, Turquia (Türkiye)
- Nigde Omer Halisdemir University
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Critérios de participação
Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.
Critérios de elegibilidade
Idades elegíveis para estudo
- Adulto
Aceita Voluntários Saudáveis
Sim
Método de amostragem
Amostra Não Probabilística
População do estudo
- Healthy individuals aged 18-40
Descrição
Inclusion Criteria:
- Healthy individuals aged 18-40
- Having sufficient visual and auditory function to understand and administer the test,
- Voluntary agreement to participate in the study and providing informed consent.
Exclusion Criteria:
- Individuals with any musculoskeletal pathology,
- History of upper extremity trauma,
- Individuals diagnosed with metabolic, neurological, or genetic diseases,
- Individuals with a history of hand surgery within the last 6 months,
- Pregnancy or breastfeeding.
Plano de estudo
Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.
Como o estudo é projetado?
Detalhes do projeto
Coortes e Intervenções
Grupo / Coorte |
Intervenção / Tratamento |
|---|---|
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Healthy adults
Young and healthy adults aged 18-40
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The second (2D) and fourth (4D) finger lengths of the participants will be measured separately in both hands by a physiotherapist with over thirteen years of clinical experience.
Hand dexterity will be assessed using the Purdue Pegboard Test.
The test will be administered according to standard procedure with participants seated at a table.
Participants will be asked to place the pegs into the corresponding holes as quickly and accurately as possible within a specified time (30 seconds).
To perform the 2-point discrimination tests, the Baseline® two-point discriminator will be used.
Measurements will be applied to the distal phalangeal pulp of the index finger on both hands while participants are seated in a comfortable position with their eyes closed.
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O que o estudo está medindo?
Medidas de resultados primários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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2-point discrimination test
Prazo: 12 months
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To perform 2-point discrimination tests, the Baseline® two-point discriminator will be used.
Measurements will be applied to the distal phalangeal pulp of the index finger on both hands while participants are seated in a comfortable position with their eyes closed.
The test will begin at a distance of 8 mm, allowing participants to perceive the stimulus as two points, and then the distance will be gradually reduced.
After 5 mm, measurements will continue at 1 mm intervals.
In each application, both contact points will be applied to the skin simultaneously and with equal pressure, and participants will be asked to indicate whether the perceived stimulus is a single point or two points.
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12 months
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Digit Ratio
Prazo: 12 months
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Measurements will be taken after participants' hands are placed on a flat surface with palms facing upwards. Finger length is defined as the distance from the midpoint of the proximal crease line where the finger joins the palm to the distal point of the fingertip. Measurements will be performed using a digital caliper with 0.01 mm accuracy, two separate measurements will be taken for each finger, and the average value will be recorded. Based on the obtained measurements, the 2D:4D finger ratio will be calculated by dividing the 2D length by the 4D length in both hands . |
12 months
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Fine motor skills
Prazo: 12 months
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The test will be administered according to standard procedure while participants are seated at a table.
Participants will be asked to place the pegs into the corresponding holes as quickly and accurately as possible within the specified time (30 seconds).
In the dominant and non-dominant hand tests, participants will be asked to place pegs with one hand for 30 seconds, while in the both-hand test, the simultaneous use of both hands will be evaluated.
The number of correctly placed pegs for each subtest will be recorded, and higher scores will be considered as better fine motor skill performance.
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12 months
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Colaboradores e Investigadores
É aqui que você encontrará pessoas e organizações envolvidas com este estudo.
Patrocinador
Investigadores
- Investigador principal: Rabia ZORLULAR, Nigde Omer Halisdemir University
Publicações e links úteis
A pessoa responsável por inserir informações sobre o estudo fornece voluntariamente essas publicações. Estes podem ser sobre qualquer coisa relacionada ao estudo.
Publicações Gerais
- Butovskaya M, Adam Y, Batsevich V, Shackelford TK, Fink B. Associations between 2D:4D from direct and radiographic measurements with handgrip strength in young adult Tuvans. Early Hum Dev. 2024 Jun;193:106037. doi: 10.1016/j.earlhumdev.2024.106037. Epub 2024 May 8.
- Fink B, Manning JT, Neave N, Tan U. Second to fourth digit ratio and hand skill in Austrian children. Biol Psychol. 2004 Nov;67(3):375-84. doi: 10.1016/j.biopsycho.2004.03.012.
Datas de registro do estudo
Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.
Datas Principais do Estudo
Início do estudo (Estimado)
1 de julho de 2026
Conclusão Primária (Estimado)
1 de julho de 2027
Conclusão do estudo (Estimado)
1 de julho de 2027
Datas de inscrição no estudo
Enviado pela primeira vez
30 de maio de 2026
Enviado pela primeira vez que atendeu aos critérios de CQ
30 de maio de 2026
Primeira postagem (Real)
4 de junho de 2026
Atualizações de registro de estudo
Última Atualização Postada (Real)
4 de junho de 2026
Última atualização enviada que atendeu aos critérios de controle de qualidade
30 de maio de 2026
Última verificação
1 de maio de 2026
Mais Informações
Termos relacionados a este estudo
Palavras-chave
Termos MeSH relevantes adicionais
Outros números de identificação do estudo
- Androgen and Skills
Plano para dados de participantes individuais (IPD)
Planeja compartilhar dados de participantes individuais (IPD)?
NÃO
Informações sobre medicamentos e dispositivos, documentos de estudo
Estuda um medicamento regulamentado pela FDA dos EUA
Não
Estuda um produto de dispositivo regulamentado pela FDA dos EUA
Não
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