Prenatal Androgen and Skills

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.

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.