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- W2901687112 abstract "This thesis investigates several aspects of visuo-spatial processing from a clinical, electrophysiological and neurofunctional perspective, with the aim of enriching our understanding of neurological syndromes that affect such fundamental perceptual-cognitive skill. A common thread is the use of cognitive load as a mean to study spatial awareness deficits following brain stroke. We show that increased task demands uncovers pathological spatial asymmetries both in right and left hemisphere damaged patients that performed at ceiling in standard paper-and-pencil tests. Although visuo-spatial deficits are commonly considered infrequent after left hemisphere lesions, the comparison between the two clinical populations showed that multitasking reveals patterns of neglect and extinction regardless of the affected hemisphere. A similar multitasking paradigm was then administered to young healthy participants in order to study the electrophysiological signatures of spatial monitoring, examining correct and erroneous processing of peripheral visual stimuli. Task difficulty was increased compared to the clinical version in order to obtain a consistent number of missed targets, thereby simulating patients’ performance. Our results support the hypothesis that processing of visual information under multitasking is regulated by a threshold criterion: the target is successfully detected only when the electrophysiological activity reaches a critical amplitude. Finally, we conducted a resting state electroencephalographic (EEG) study in order to correlate patterns of spontaneous brain activity with neuropsychological scores and multitasking costs indices. This investigation builds on the hypothesis that cognition is not only associated with the specialization of brain regions, but also with the large-scale organization of functionally connected networks. A state-of-art methodology was used to reconstruct 14 brain networks, previously detected in fMRI studies, from electrophysiological signals in chronic stroke patients. The integration of critical clusters within each network was then examined, exploring also its correlation with behavioural measures and the contribution of specific frequency bands. Overall, this empirical work provides an original contribution to the study of the mechanisms underlying brain organization after unilateral damage and the consequent implications for cognitive performance." @default.
- W2901687112 created "2018-11-29" @default.
- W2901687112 creator A5012305467 @default.
- W2901687112 date "2018-01-05" @default.
- W2901687112 modified "2023-09-27" @default.
- W2901687112 title "The cognitive demand of multitasking under visuo-spatial processing: Assessment, ERPs and electrophysiology of brain networks in chronic stroke patients" @default.
- W2901687112 hasPublicationYear "2018" @default.
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