In birds, a lateralised visual input during early development importantly modulates morphological and functional asymmetries of vision. We tested the hypothesis that human handedness similarly results from a combination of inborn and experience-driven factors by analysing sidedness in children suffering from congenital muscular torticollis. These children display a permanently tilted asymmetric...

The relationship between handedness and mathematical ability is still highly controversial. While some researchers have claimed that left-handers are gifted in mathematics and strong right-handers perform the worst in mathematical tasks, others have more recently proposed that mixed-handers are the most disadvantaged group. However, the studies in the field differ with regard to the ages and th...

The objective of this study was to evaluate the relation between handedness, and the risk of malignant and benign brain tumors. Handedness has been hypothesized to serve as a behavioral marker of prenatal hormonal exposures or other factors that influence subsequent cancer risk. A case-control study was conducted at hospitals in three United States cities between 1994 and 1998. The cases were a...

Based on evidence derived from personal data and a comprehensive review of the literature, this article provides a perspective of laterality of motor control in humans. The evidence supports existence of directionality in callosal traffic, codified in handedness. However, it is the neural handedness that definitively reveals the directionality of signal traffic between the executive and the min...

Our objective was to demonstrate that human population-level, right-handedness, is not species specific, precipitated from language areas in the brain, but rather is context specific and inherited from a behavior common to both humans and great apes. In general, previous methods of assessing human handedness have neglected to consider the context of action, or employ methods suitable for direct...

BACKGROUND In non-human primates grasp-related sensorimotor transformations are accomplished in a circuit involving the anterior intraparietal sulcus (area AIP) and both the ventral and the dorsal sectors of the premotor cortex (vPMC and dPMC, respectively). Although a human homologue of such a circuit has been identified whether activity within this circuit varies depending on handedness has y...

Recent studies have demonstrated a close resemblance between some handedness patterns in great apes and humans. Despite this, comparative systematic investigations of manual lateralization in non-primate mammals are very limited. Among mammals, robust population-level handedness is still considered to be a distinctive human trait. Nevertheless, the comprehensive understanding of handedness evol...

The Geschwind-Behan-Galaburda and sexual differentiation models predict an association between elevated foetal androgen exposure left-handedness whereas the callosal hypothesis predicts opposite. We present a meta-analysis of correlations handedness digit ratio (2D:4D), putative marker prenatal testosterone. Left-handedness predicted low (male-typical) right-hand (R2D:4D), high (female-typical)...

The preference for using the right or left hand different uni-manual tasks is known as handedness. Handedness functional asymmetry has a correlation with asymmetric brain. Most types of tools have been developed right-handed use, leading to adaptations between left-handed and individuals. Visuospatial, one cognitive processes, ability visualize two- three-dimensional objects. This function allo...