Brain imprints on cranial bones from humans and great apes refute the long-standing belief that the human pattern of brain asymmetry is unique. Researchers noted similar patterns of asymmetry in our great ape ancestors. However, there was more variability in this pattern in humans. Findings suggest lateralized and uniquely human cognitive abilities, such as language, evolved by adapting an ancestral brain asymmetry pattern.
Four genetic regions have been identified as playing a role in left-handedness. Three of the four genes were associated with proteins involved in brain development and structure. Neuroimaging revealed those who were left-handed had increased functional connectivity between left and right language networks. Researchers also found correlations between the genetic regions associated with left-handedness and slightly reduced Parkinson's risk, but a slightly increased risk for schizophrenia.
The left and right hemispheres of the brain are characterized by different word processing strategies.
Researchers look at the myths and the facts about left-handedness.
According to researchers, the prevalence of being left-handed is lower in children who were breastfed compared to those who were bottle fed. The study proposes breastfeeding may optimize brain lateralization towards dominant handedness.
A new study looks at why people and animals tend to naturally favor one side of our bodies over the other.
Researchers have found the earliest evidence to date of right handedness in fossil records dating back 1.8 million years.