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Right-hemispheric activation in converted left-handers may reflect suppression of unwanted left-hand movements. Alternatively, this activity may represent persistent left-handedness and, as such, demonstrate a hemispheric asymmetry of hand movement representations in cortical motor association areas in relation to the direction and degree of handedness.
Abstract Until some decades ago, left-handed children who attended German schools were forced to learn to write with their right hand. Publication types Research Support, Non-U. Substances Oxygen Radioisotopes. Children with ASDs also show motor abnormalities as early as seven months of age. Current diagnoses of ASDs tend to occur relatively late, when children fail to produce and understand basic language.
Late diagnoses can limit benefits that may come from early interventions and therapies. Infant brains are incredibly flexible and the right kinds of early intervention may improve later cognitive development and mental health. Handedness is not the only bias of our motor skills that comes from cerebral lateralisation. A majority of the population has a right hemisphere of the brain that is dominant for responding to danger. This means that we are faster at recognising threatening faces and expressions when they appear to our left side in the left visual field compared to our right side.
This has been demonstrated in a range of classic psychology laboratory studies where adults are faster to judge pictures of faces expressing negative emotions presented to their left compared to those presented to their right. Mapping the developmental paths of motor biases and cognitive abilities in children provides a novel way for us to better understand the relationship between brain organisation, brain function and behaviour.
Portsmouth Climate Festival — Portsmouth, Portsmouth. Edition: Available editions United Kingdom. Become an author Sign up as a reader Sign in. Gillian Forrester , University of Westminster. Our objective was to determine whether mixed-handedness, which is associated with atypical cerebral laterality, is associated with language, scholastic, and ADHD symptoms in childhood and adolescence. Results: Mixed-handed children, relative to right-handed, had approximately a twofold increase in odds of having difficulties with language and scholastic performance at the age of 8 years.
Eight years later, as year-olds, adolescents had twofold increase in odds concerning difficulties in school with language and with ADHD symptoms.
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