Navegando por Palavras-chave "Pupilometria"
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- ItemAcesso aberto (Open Access)Equipamento portátil para ensaios simultâneos de teste de vigilância psicomotora e pupilometria(SBEB - Sociedade Brasileira de Engenharia Biomédica, 2013-03-01) Souza, John Kennedy Schettino De; Ginani, Giuliano Emerenciano [UNIFESP]; Pompéia, Sabine [UNIFESP]; Baron, Jerome; Tierra-criollo, Carlos Julio; Universidade Federal de Minas Gerais Engenharia Elétrica; Universidade Federal de São Paulo (UNIFESP)This paper describes a system with potential for identification of sleep deprivation, which, based on our bibliographical survey, has not yet been described in the literature. The system combines two methodologies, i. e., Psychomotor vigilance test (PVT) and pupillometry, which are among the leading methods for the study of sleep deprivation. However, due to peculiarities of both methodologies, some adaptations were made in their procedures to allow them to co-exist in the same system. Such integration may not only ensure the complementarity of indexes, making the identification of sleep deprivation more solid, but also set up the equalization of the subject's psycho-physiological state, which is not possible in tests performed with a time lag. In this study, the performance of measurements provided by the system was assessed in subjects on alert. However, some measurements present a displacement with respect to their average values, which, according to assessment, are determined by system's technical requirements. The results obtained in this assessment, combined with the increasing demand for large scale application tools, able to be used outside the limits of the laboratory environment for studies in sleep deprivation disorders, point to this system as a potential tool. However, the undertaking of a rigorous experiment is necessary to assess whether the indexes obtained by the system allow the robust identification of sleep deprivation.
- ItemAcesso aberto (Open Access)Esforço mental e suscetibilidade à interferência na recuperação da memória episódica(Universidade Federal de São Paulo (UNIFESP), 2018-08-30) Alves, Marcus Vinicius Costa [UNIFESP]; Bueno, Orlando Francisco Amodeo [UNIFESP]; http://lattes.cnpq.br/3763546320226094; http://lattes.cnpq.br/1441158405773422; Universidade Federal de São Paulo (UNIFESP)Forgetting is the inability to retrieve information that could be retrieved before. The Interference Theory suggests that information tends to dispute its existence when learned by individuals, so forgetting would be justified by the dispute of information prior to the entry of the target memories (Proactive Interference) and subsequent to that entry (Retroactive Interference). Currently, there is a hypothesis that memory consolidation is impaired by the introduction of tasks demanding cognitive effort during the time it is occurring. The present study aimed to investigate whether the loss of information related to cognitive effort could be explained by interference in memory consolidation or because of the limited ability of individuals' mental resources to control interfering stimuli. To measure cognitive effort we registered pupil dilation. Experiment 1 (N - 20) replicated our previous study that demonstrated a possible non - existence of the interfering effect on memory consolidation. Experiment 2 (N - 22) tested how the tasks performed at the initial moment of memory consolidation could influence recall by interfering with more labile memories, but this effect was not fund. In Experiment 3 (N - 30) the participants performed tasks over a longer period of time, testing whether loss of information would come from RI in memory consolidation or cognitive overload, indicating the possibility of the second hypothesis being more correct. Finally, in Experiment 4 (N - 45), we tested in groups how different tasks interfere in consolidation causing a cognitive overload. The results of our study indicate that there is no interfering effect of cognitive effort on memory consolidation, but rather a proactive and retroactive effect on the retrieval of information that people have for evocation.
- ItemAcesso aberto (Open Access)Resultados preliminares de um sistema computadorizado e estereoscópico para pupilometria in vivo(Conselho Brasileiro de Oftalmologia, 2008-12-01) Carvalho, Luis Alberto Vieira de [UNIFESP]; Paranhos Junior, Augusto [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Instituto Israelita de Ensino e Pesquisa Albert Einstein Pesquisa ClínicaPURPOSE: We developed a digital system with accommodation capacities for measurement of the diameter and shape of the in vivo pupil for 10 different levels of illumination intensity, varying from mesopic to photopic. METHODS: An optical system for conjugating images from an infrared and white light illuminated pupil was designed and mounted using an ophthalmoscope helmet and a typical diving mask as support for a high-resolution and sensitivity CCD. Using an IBM compatible computer sequences of video in AVI format were digitized for several seconds at a mean rate of 30 Hz. Algorithms using principles of image processing were implemented for detection of the pupil edges. RESULTS: We present preliminary results of this system for a voluntary patient. Data for the horizontal (x) and vertical (y) central position and for the diameter of the pupil were then exported to files that could be read by typical spread sheet programs (Excel). CONCLUSIONS: In this manner, precise data can be obtained stereoscopically (for both pupils at the same time) for any patient, given that the accommodation process is guaranteed by using a white LED virtual mire located 6 meters from the patient's eye. An electronic board precisely controls the level of illumination. We believe here developed instrument may be useful in certain ophthalmic practices where precise pupil geometric data are needed.