Related Experiment Video
Updated: Jan 11, 2026

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
Published on: March 21, 2025
Handedness in association with same-sex sexual attraction in Iran
Mostafa Sadr-Bazzaz1, Paul L Vasey1
1Department of Neuroscience, University of Lethbridge, Lethbridge, Canada.
None:
Previous research has shown that same-sex sexual orientation is associated with differences in handedness. This study investigated this relationship by comparing Iranian cisgender gynephilic males (n = 239), cisgender ambiphilic males (n = 108), cisgender androphilic males (n = 314), transgender androphilic males (n = 103), cisgender androphilic females (n = 250), cisgender ambiphilic females (n = 96), cisgender gynephilic females (n = 32), and transgender gynephilic females (n = 123). Using a modified version of Edinburgh Handedness Inventory, we compared laterality index scores, rates of non-right-handedness, and extreme right-handedness between groups. Also, two features of handedness including its direction (i.e., the dominant hand) and strength (i.e., the degree of variability in preferring one hand over the other) were explored. We found that compared to gynephilic males, cisgender ambiphilic males had elevated non-right-handedness, and cisgender and transgender androphilic males had elevated extreme right-handedness. Our results indicated that right-handed cisgender androphilic males and females had greater strength compared to right-handed cisgender gynephilic males, while right-handed cisgender ambiphilic females and transgender gynephilic females had weaker strength compared to right-handed cisgender androphilic females. This study highlighted the importance of studying handedness direction and strength to understand underlying developmental factors influencing sexual orientation.
Related Concept Videos
Socioemotional Experience and Gender Development
Factors Influencing Attraction III: Similarity
Surveys
Factors Influencing Attraction II: Physical Attraction
Factors Influencing Attraction IV: Reciprocity
Lateralization

