OBJECTIVE: Autism is referred to as cerebral lateralization abnormality. In this study, the possible relationships among handedness, eyedness and nasal cycle in autism have been investigated. MATERIALS AND METHODS: Thirty-seven children with autism and 20 controls were included in the study. The patient group included 27 boys and 10 girls who ranged in age from 5 to 20 years. For hand preference, hand used to write and throw a ball was accepted as dominant hand. For eye preference or dominance, eye used to look through keyhole of a door was accepted as dominant eye. Nasal dominance was assessed by a method of measuring the nasal airflow. RESULTS: The rates of left-handedness and left-eyedness were higher in children with autism compared to normal populations. A majority of children with autism had left nasal dominance. CONCLUSION: Autism and early language impairment may be associated with left handedness, eyedness and nasal dominance. (Dane, S. & Balci, N.(2007). Handedness, eyedness and nasal cycle in children with autism. International Journal of Developmental Neuroscience, 25(4), 223-6.)
Central to my understanding of handedness is Marion Annett’s theory that the left handed are really random handed, along with almost 10% of the right handers in society. What keeps coming to my mind is, if autism is increasing, and those increases are accompanied by estimations that it is just diagnosis that is more universal, then tell me if there are increases in left handedness. If there are increases in the left handed in this society, that suggests that there are increases in random handedness with is very likely the same as saying there are increases in male maturational delay.
If there are increases in both left handedness and autism, perhaps theorists can start offering attention to theories of autism that have to do with our evolutionary origins.