The researchers found that individuals on the autism spectrum were 2.49 times more likely to be left-handed than people without autism. Altogether, about 28 percent of individuals on the autism spectrum were left-handed as compared to about 10 percent in the general population.
Findings from the National Institutes of Health (NIH) suggest that individuals with autism are 2 to 3 times more likely to be mix-handed, left-handed, or of unclear handedness than typically-developing individuals.
About stimming and autism
Stimming might include: hand and finger mannerisms – for example, finger-flicking and hand-flapping. unusual body movements – for example, rocking back and forth while sitting or standing. posturing – for example, holding hands or fingers out at an angle or arching the back while sitting.
The results show evidence of a trend towards elevated levels of atypical handedness when it comes to differences in left- and mixed-handedness (p = 0.09 and p = 0.07, respectively), but do show clear evidence of elevated levels of non-right-handedness between individuals with ADHD and controls (p = 0.02).
Many autistic people have problems like: feeling very worried a lot of the time (anxiety) feeling unhappy, irritable or hopeless (depression) feeling a need to keep doing certain actions (obsessive compulsive disorder, or OCD)
Finger movements in childhood are repeated flicking, tapping, or unique finger motions commonly associated with a developmental disability like the Autism Spectrum. These movements may be rhythmic, and it may feel that your child has no control or awareness of their fingers.
There are other brain disorders that mimic autism symptoms, like ADHD and anxiety disorders, including selective mutism. Autism can be misdiagnosed as another disorder with some shared symptoms.
In their analysis of 144 handedness and brain laterality studies—accounting for a total of nearly 1.8 million individuals—University of Oxford psychologists Marietta Papadatou-Pastou, PhD, and Maryanne Martin, PhD, found that males are about 2 percent more likely to be left-handed than females.
Overall, individuals with ADHD had a 27.3 percent chance of being either left-handed or mixed-handed compared to 18.1 percent in the general population. So the results suggest that the effects are smaller than for the autism spectrum, but generally go in the same direction.
A broader top face, a shorter middle face, wider eyes, a wider mouth, and a philtrum are some of the common facial features seen in children with ASD [16,17].
At times autistic individuals may stim to meet a specific goal, like balancing sensory input, for example finger flicking or flapping hands to compensate for poor spatio-visual skill. This may be the reason stimming is sometimes defined as automatically reinforced behavior rather than a self-stimulatory behavior.
“There's a little bit of difficulty in autism communicating between the left and right hemispheres in the brain. There's not as many strong connections between the two hemispheres,” Dr. Anderson says.
A single gene might be passed from parents to children to influence which hand a child favours. If a particular version of this gene is inherited, the child may be more likely to be left-handed, depending on reinforcement and other environmental influences.
Left-handedness is now accepted as a completely normal aspect of a child's development. A child's handedness will be fixed before they're born and won't be immediately apparent when they are an infant. Experts believe that if both parents are left-handed there is a 50-50 chance that a child will be left-handed too.
But other research suggests that there are probably dozens of genes that play a role in determining whether we end up writing with our left hand or our right. On top of that, other studies have linked factors such as oestrogen levels and birth position to varying levels of left- and right-handedness.
Babe Ruth. The Babe is probably the most famous left-handed slugger of all-time.
The other hand, comparatively often the weaker, less dextrous or simply less subjectively preferred, is called the non-dominant hand. In a study from 1975 on 7,688 children in US grades 1-6, left handers comprised 9.6% of the sample, with 10.5% of male children and 8.7% of female children being left-handed.
Research has shown that left-handedness is more common among individuals with certain cognitive disorders, such as autism,3 ADHD,4 and developmental coordination disorder (DCD).
But handedness has its roots in the brain—right-handed people have left-hemisphere-dominant brains and vice versa—and the lefties who claim Einstein weren't all that far off. While he was certainly right-handed, autopsies suggest his brain didn't reflect the typical left-side dominance in language and speech areas.
Does The Father Or Mother Carry The Autism Gene? Autism was always thought to have a maternal inheritance component, however, research suggests that the rarer variants associated with the disorder are usually inherited from the father.
The primary characteristics are 1) poorly developed social skills, 2) difficulty with expressive and receptive communication, and 3) the presence of restrictive and repetitive behaviors.
If you still hear people use some of the older terms, you'll want to know what they mean: Asperger's syndrome. This is on the milder end of the autism spectrum. A person with Asperger's may be very intelligent and able to handle their daily life.