Acalculia, aphasia and spatial disorders in left and right brain-damaged patients

dThe paper reports the performance of 50 left- and 26 vascular right-brain- damaged (LBD, RED) patients in the EC301 Calculation Battery, which explore s different aspects of number and calculation processing. All patients unde rwent a comprehensive neuropsychological testing that also included evaluat ion for the presence and type of aphasia in LED patients, and of spatial di sorders in RED patients. LED were subdivided in three groups: non-aphasic ( NA), Broca and Wernicke aphasics. Results indicate that language and calcul ation disorders can dissociate. The relationship between spatial and calcul ation disorders in RED patients is less clear. No significant difference wa s found between Broca and Wernicke aphasics, nor between NA and RED patient s. In the transcoding tasks treading or writing to dictation numbers and nu mber words, for instance) syntactic errors were the most frequent type of e rrors in all groups. They were also present when neither the input nor the required response was in the Arabic code, and a word-by-word strategy could have been used to read the number word or write a spoken number in the ort hographic code.