Browsing by Author "Almeida, I."
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- Effects of emotional valence and three-dimensionality of visual stimuli on brain activation: an fMRI studPublication . Dores, Artemisa Rocha; Almeida, I.; Barbosa, F.; Castelo-Branco, M.; Guerreiro, S.; Almeida, I.; Reis, M.; Sousa, L. de; Castro Caldas, A.Examining changes in brain activation associated with emotion-inducing stimuli is essential to the study of emotions. Due to the ecological potential of virtual reality in neurocognitive rehabilitation, inspection of whether brain activation in response to emotional stimuli can also be modulated by the three-dimensional properties of the images is now important. This study sought to test whether the activation of brain areas involved in the emotional processing of scenarios of different valences can be modulated by three dimensionality. It focused on the interaction effect among emotion-inducing stimuli of different emotional valences (pleasant, unpleasant and neutral valences) and visualization types (2D, 3D).
- Effects of emotional valence and three-dimensionality of visual stimuli on brain activation: an fMRI studyPublication . Dores, Artemisa Rocha; Almeida, I.; Barbosa, F.; Castelo-Branco, M.; Monteiro, L.; Reis, M.; Sousa, L. de; Caldas, A. CastroExamining changes in brain activation linked with emotion-inducing stimuli is essential to the study of emotions. Due to the ecological potential of techniques such as virtual reality (VR), inspection of whether brain activation in response to emotional stimuli can be modulated by the three-dimensional (3D) properties of the images is important. The current study sought to test whether the activation of brain areas involved in the emotional processing of scenarios of different valences can be modulated by 3D. Therefore, the focus was made on the interaction effect between emotion-inducing stimuli of different emotional valences (pleasant, unpleasant and neutral valences) and visualization types (2D, 3D). However, main effects were also analyzed.METHODS: The effect of emotional valence and visualization types and their interaction were analyzed through a 3x2 repeated measures ANOVA. Post-hoc t-tests were performed under a ROI-analysis approach. The results show increased brain activation for the 3D affective-inducing stimuli in comparison with the same stimuli in 2D scenarios, mostly in cortical and subcortical regions that are related to emotional processing, in addition to visual processing regions. This study has the potential of clarify brain mechanisms involved in the processing of emotional stimuli (scenarios’ valence) and their interaction with three-dimensionality.
- A new fMRI paradigm to study behavioral and neural bases of visual working memoryPublication . Dores, Artemisa Rocha; Barbosa, F.; Almeida, I.; Guerreiro, S.; Rocha, B.M.; Carvalho, I.P.; Marques, A.J.; Sousa, L.D.; Castro-Caldas, A.Working memory (WM) is a cognitive process that refers to storing information in a temporary system that allows monitoring and handling this information.
- Reabilitação cognitiva: desenvolvimento de um ambiente de treino em realidade virtualPublication . Dores, Artemisa R.; Almeida, I.; Guerreiro, S.; Castro-Caldas, A.A utilização de Realidade Virtual (RV) no domínio da Reabilitação Cognitiva tem estimulado investigação com pacientes que apresentam défices cognitivos, resultado de causas como Traumatismos Crânio-Encefálicos (TCE) ou Acidentes Vasculares Cerebrais (AVC).