You are here

Andrea Bertana's graduation

News date: 
Thursday, 17 July, 2014

On July 17th, Andrea Bertana successfully defended his master thesis entitled "A methodological study: Hyperalignment". In the thesis, he explored some methodological aspects of hyperalignment, the method proposed to project the brains of multiple subjects in group studies to the same functional space.

During the recent years, the interest toward between subjects (BS) studies has consinstenly grown. A major problem of such studies is how to compare brains that are anatomicaly and functionally different between them. Many algorithms help to account for anatomical differences and spatial normalization of brains is a common procedure of neuroimaging analyisis. However, those methods cannot account for functional dissimilarites across brains. In this context, functional hyperalignment [Haxby, 2011] turned out to be an effective multivariate method to functionally align different participants brain responses. Because of the novelty of such method, some aspects are still under-investigated. For instance, hyperalignment has been applied only on category representation studies, restricting the trasformation within the ventro-temporal cortex, a region showing high selectivity of responses to visual stimulations. The author explored two points: first, the effectiveness of the method when applied on data referring to different cognitive tasks, involving responses localized in different regions with respect to the ventro-temporal cortex; second, the relationship between the number of considered participants and the final results