<P> As of 2007, researchers Lyytinen et al. are searching for a link between the neurological and genetic findings, and the reading disorder . There are many previous and current theories of dyslexia, but one that has much support from research is that, whatever the biological cause, dyslexia is a matter of reduced phonological awareness, the ability to analyze and link the units of spoken and written languages . </P> <P> In 2008, S Heim et al. was one of the first studies not to just compare dyslexics with a non dyslexic control, but to go further and compare the different cognitive sub groups with a non dyslexic control group . Different theories conceptualise dyslexia as either a phonological, attentional, auditory, magnocellular, or automatisation deficit . Such heterogeneity suggests the existence of yet unrecognised subtypes of dyslexics suffering from distinguishable deficits . The purpose of the study was to identify cognitive subtypes of dyslexia . Out of 642 children screened for reading ability 49 dyslexics and 48 controls were tested for phonological awareness, auditory discrimination, motion detection, visual attention, and rhythm imitation . A combined cluster and discriminant analysis approach revealed three clusters of dyslexics with different cognitive deficits . Compared to reading - unimpaired children cluster no . 1 had worse phonological awareness; cluster no . 2 had higher attentional costs; cluster no . 3 performed worse in the phonological, auditory, and magnocellular tasks . These results indicate that dyslexia may result from distinct cognitive impairments . As a consequence, prevention and remediation programmes should be specifically targeted for the individual child's deficit pattern . </P> <P> Also in 2008, Wai Ting Siok et al. describe how dyslexia is language dependent, and especially between alphabetic and non-alphabetic writing systems . </P> <P> In 2010, KK Chung et al. investigated the "Cognitive profiles of Hong Kong Chinese adolescents with dyslexia". </P>

Where did the first consensus definition of dyslexia occur