Encontrados 6 documentos, a visualizar página 1 de 1
Stress affects theta activity in limbic networks and impairs novelty-induced ex...
Jacinto, Luís; Reis, Joana; Dias, Nuno S.; Cerqueira, João J.; Correia, José Higino; Sousa, NunoExposure to a novel environment triggers the response of several brain areas that regulate emotional behaviors. Here, we studied theta oscillations within the hippocampus (HPC)-amygdala (AMY)-medial prefrontal cortex (mPFC) network in exploration of a novel environment and subsequent familiarization through repeated exposures to that same environment; in addition, we assessed how concomitant stress exposure cou...
Chronic stress disrupts neural coherence between cortico-limbic structures
Dias, Nuno S.; Oliveira, João Filipe; Correia, Mariana; Gama-Pereira, Filipa; Sardinha, Vanessa Morais; Lima, Ana; Oliveira, Ana FilipaChronic stress impairs cognitive function, namely on tasks that rely on the integrity of cortico-limbic networks. To unravel the functional impact of progressive stress in cortico-limbic networks we measured neural activity and spectral coherences between the ventral hippocampus (vHIP) and the medial prefrontal cortex (mPFC) in rats subjected to short term stress (STS) and chronic unpredictable stress (CUS). CU...
Neural Electrode Array Based on Aluminum: Fabrication and Characterization
Peixoto, Alexandre; Goncalves, Sandra; Da Silva, Alexandre Ferreira; Dias, Nuno S.; Correia, J. HiginoA unique neural electrode design is proposed with 3 mm long shafts made from an aluminum-based substrate. The electrode is composed by 100 individualized shafts in a 10 × 10 matrix, in which each aluminum shafts are precisely machined via dicing-saw cutting programs. The result is a bulk structure of aluminum with 65 ° angle sharp tips. Each electrode tip is covered by an iridium oxide thin film layer (ionic tr...
Effects of Age-Related Cognitive Deficits on EEG Phase Coherence
Ferreira, Daniela S.; Reis, Joana; Portugal, Ana Maria; Pinho, Francisco; Jacinto, Luís; Dias, Nuno S.Body and brain undergo several changes with aging. One of these changes is the loss of neuroplasticity, which leads to the decrease of cognitive abilities. Hence the necessity of stopping or reversing these changes is of utmost importance to contemporary society. In the present work, electroencephalogram (EEG) markers of cognitive decline are sought whilst the subjects perform the Wisconsin Card Sorting Test (W...
A Wireless EEG Acquisition Platform based on Embedded Systems
Pinho, Francisco; Correia, José Higino; Dias, Nuno S.This paper proposes a wireless EEG acquisition platform based on Open Multimedia Architecture Platform (OMAP) embedded system. A high-impedance active dry electrode was tested for improving the scalp- electrode interface. It was used the sigma-delta ADS1298 analog-to-digital converter, and developed a “kernelspace” character driver to manage the communications between the converter unit and the OMAP’s ARM core....
Cognitive intervention protocol for age-related memory impairments
Portugal, Ana Maria; Ferreira, Daniela Silva; Reis, Joana Santos; Pinho, Francisco; Dias, Nuno S.With the number of elderly people increasing tremendously worldwide, comes the need for effective methods to maintain or improve older adults' cognitive performance. Using continuous neurofeedback, through the use of EEG techniques, people can learn how to train and alter their brain electrical activity. A software platform that puts together the proposed rehabilitation methodology has been developed: a digital...
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