(5), 528-540. doi:10.1080/13576500802637872); however, no significant effects for R2D:4D were observed once these samples were removed. The results do not confirm any theory linking prenatal androgens with handedness, so we speculate they instead reflect the mechanical action of writing causing subtle changes in the musculature and/or fat pads of the fingers. Gripping a pen/pencil might cause an increase in 2D relative to 4D (and/or decrease in 4D relative to 2D) resulting in higher ratios on the writing-hand; furthermore, this could differ between left- and right-handers due to writing in the left-to-right direction (as in English) having asymmetrical effects depending on which hand is used.
| Authors | Richards, Gareth; Medland, Sarah E; Beaton, Alan A |
|---|---|
| Journal | Laterality |
| Pages | 1-64 |
| Volume | 26 |
| Date | 1/01/2021 |
| Grant ID | |
| Funding Body | |
| URL | http://www.ncbi.nlm.nih.gov/pubmed/?term=10.1080/1357650X.2020.1862141 |