2025-12-022025-12-022025-08-29SILVA FILHO, Helder Luiz de Souza da. Orientadora: Suzana Cescon de Souza. 2025. 55f. Trabalho de Curso (Bacharelado em Engenharia Elétrica e Biomédica) – Faculdade de Engenharia Elétrica e Biomédica, Instituto de Tecnologia, Universidade Federal do Pará, Belém, 2025. Disponível em: https://bdm.ufpa.br/handle/prefix/8919. Acesso em:.https://bdm.ufpa.br/handle/prefix/8919This study investigated the modulation of the Theta band during resting periods (pre and post-task) in individuals with Autism Spectrum Disorder (ASD) and in neurotypical individuals (Control group), using HHSA in the Theta band (4–8 Hz). The analysis was conducted through lectroencephalographic (EEG) signals recorded before and after the performance of a sustained visual attention task. The methodology employed the Holo Hilbert Spectral Analysis (HHSA), an advanced spectral decomposition technique that enables high-resolution visualization of carrier frequency (FM) and amplitude modulation (AM) oscillations, with a specific focus on channels P3 and P4—parietal regions directly associated with attention, sensorimotor integration, and working memory. Results showed that the Control group presented clear Theta band reorganization after the task, with shifts in frequency and amplitude, particularly in channel P4, indicating efficient adaptive neural responses to cognitive demands. In contrast, the ASD group exhibited reduced modulation and low functional asymmetry between hemispheres, suggesting less flexible patterns of neural activation. Both groups presented a decrease in Theta spectral intensity after the task, though with distinct functional implications. The combined analysis of individual and group-average data reinforces the potential of the Theta band as a functional marker of neural reorganization and highlights HHSA as a robust tool for detecting subtle changes in cortical dynamics. These findings contribute to a deeper understanding of neurofunctional differences between individuals with and without ASD, with possible implications for future diagnostic and therapeutic approaches.Acesso AbertoTranstorno do espectro autistaEEGBanda thetaHHSAAtençãoReorganização funcionalAutism spectrum disorderTheta BandAttentionFunctional reorganizationCNPQ::ENGENHARIAS::ENGENHARIA BIOMEDICATrabalho de Curso - Graduação - MonografiaAttribution-NonCommercial-NoDerivs 3.0 Brazil