Browsing by Author "Toloza-Ramirez, David"

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    Semantic and phonological processing in adults and healthy older adults: An FMRI study
    (2023) Toloza-Ramirez, David; Julio Ramos, Teresa Paz; Solomons, Daniel; Santibanez, Rodrigo; Arraño Carrasco, Leonardo Marcelo; Méndez Orellana, Carolina Patricia
    Semantic and phonological processing (SP and PP, respectively) are described within the dorsal and ventral stream model. Studies have related both types of processing to specific brain areas; however, neuroimaging findings suggest that no exclusive brain areas exist for SP and PP. Overt and covert task paradigms in fMRI have been proposed to examine language processing. However, cognitive processing differs in both paradigms, generating different patterns of neural activity. Covert paradigms do not change language lateralization and provide essential information for understanding language networks. Bilateral activation in frontal areas for SP and PP has been reported as a response to lower task performance in older adults. However, understanding the activation pattern for SP and PP in healthy adults and older adults is still challenging. Therefore, this study aims to determine phonological and semantic auditory processing using a receptive modality task in healthy adults and older people.
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    The potential use of crossed cerebro-cerebellar activation to evaluate language reorganization: A case study of recurrent malignant glioma
    (2023) Julio Ramos, Teresa Paz; Toloza-Ramirez, David; Arraño Carrasco Leonardo Marcelo; Mery Muñoz, Francisco Javier; Méndez Orellana, Carolina Patricia
    Background: The crossed cerebro-cerebellar (CCC) language activation guides the determination of language dominance because it is generally undisturbed by a lesion localized in supratentorial language areas. Limited evidence suggests brain plasticity could underly language recovery after tumor resection surgery. A recent study revealed two patterns of language reorganization; however, language lateralization was determined after visual inspection of a single task (phonemic fluency). Aim: To describe eventual changes of language lateralization as part of a reorganization in a tumor brain patient with recurrent malignant glioma.