ERIC Number: EJ964936
Record Type: Journal
Publication Date: 2012-May
Pages: 9
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0028-3932
EISSN: N/A
The Neural Correlates of Object-Centered Processing in Reading: A Lesion Study of Neglect Dyslexia
Ptak, Radek; Di Pietro, Marie; Schnider, Armin
Neuropsychologia, v50 n6 p1142-1150 May 2012
Neglect dyslexia--a peripheral reading disorder generally associated with left spatial neglect--is characterized by omissions or substitutions of the initial letters of words. Several observations suggest that neglect dyslexia errors are independent of viewer-centered coordinates; the disorder is therefore thought to reflect impairment at the level of object-centered representations. This hypothesis is indirectly supported by lesion studies connecting object-centered neglect errors with damage to posterior cortical regions lying in the ventral visual stream. Here, we performed a lesion-symptom mapping study of 40 patients with spatial neglect asked to read words presented at different positions relative to a viewer-centered coordinate frame. We found that the frequency of object-centered reading errors was constant across horizontal positions, whereas the frequency of entirely neglected words (reflecting a page-centered deficit) linearly increased from right to left. Damage to the intraparietal sulcus and the angular and middle temporal gyri was the best predictor of object-centered errors. We discuss these findings with reference to a role of the posterior parietal lobe in adapting the size of the attentional focus and biasing object representations elaborated in the ventral visual stream. (Contains 4 tables and 5 figures.)
Descriptors: Beginning Reading, Dyslexia, Brain Hemisphere Functions, Correlation, Neurological Impairments, Error Patterns, Symptoms (Individual Disorders), Predictor Variables, Attention Control, Patients, Spatial Ability, Reading Processes
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A