Abstract:
:The performance of developmentally dyslexic children and adults was studied upon a range of tasks that involved executive functioning. Both adult and child samples of dyslexics were found to under-perform on the group-embedded figures test. This test required the identification of constituent parts from within complex visual arrays, with good performance necessitating the inhibition of the processing of the surrounding context. A general deficit on visual-spatial tasks was eliminated as an explanation as dyslexics performed normally upon a range of other non-verbal assessments. The dyslexics consistently demonstrated a deficit in digit span tasks, a decrement that was increased with distractors, again suggesting difficulties in inhibiting the processing of the surrounding context. A deficit was also identified upon a verbal fluency task without a deficit in vocabulary level. Additionally, a specific deficit in the recollection of the temporal order of the presentation of items was in evidence, without a deficit in the recognition of the items themselves. The findings taken as a whole suggest that dyslexic individuals show deficiencies in executive functions relating to inhibition of distractors and to sequencing of events, a set of tasks associated with left prefrontal cortex functioning in the acquired neuropsychology literature.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Brosnan M,Demetre J,Hamill S,Robson K,Shepherd H,Cody Gdoi
10.1016/s0028-3932(02)00046-5subject
Has Abstractpub_date
2002-01-01 00:00:00pages
2144-55issue
12eissn
0028-3932issn
1873-3514pii
S0028393202000465journal_volume
40pub_type
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