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RESUMO: O objetivo deste texto é debater como infância, criança, surdez e experiência visual têm se configurado como temas investigativos na Educação, detendo-se em uma análise sobre o olhar das crianças surdas e como sua experiência visual produz e é produzida pelo olhar. Realizou-se um levantamento bibliográfico no Banco de Theses e Dissertações da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes) e nos trabalhos aprovados nas reuniões nacionais da Associação Nacional de Pós-Graduação e Pesquisa em Educação (ANPEd) - GT Educação Especial, tendo como vetor decisivo pesquisas que tinham a infância e/ou a criança surda como temas centrais. Na análise das 23 pesquisas encontradas, verificaram-se três recorrências: a criança ou a infância surda como conceitos abrangentes, pouco abordados em suas singularidades; a experiência visual da criança surda assumida como secundária à aquisição, seja de outras linguagens (como, por exemplo, a escrita), seja da Língua Brasileira de Sinais (Libras), portanto, como experiência suplementar; o conceito de aprendizagem da criança surda vinculado à imagem como recurso didático. Com base nisso, percorreram-se pesquisas e trabalhos que rompem com essas recorrências e, assim, indicam caminhos para a construção de uma agenda de pesquisa sobre criança e infância surda.
ABSTRACT: The purpose of this text is to discuss how childhood, children, deafness and visual experience have been configured as research themes in Education, focusing on an analysis of the gaze of deaf children and how their visual experience produces and is produced by the gaze. A bibliographic review was carried out in the Theses and Dissertations Database of the Coordination for the Improvement of Higher Education Personnel (CAPES) and in the approved papers for the national meetings of the National Association of Research and Graduate Studies on Education (ANPEd) -Special Education Work Group), having as a decisive vector research that had childhood and/or deaf child as central themes. In the analysis of the 23 studies founded, three recurrences were verified: deaf child or childhood as general concepts, not assumed in their singularities; the visual experience of the deaf child assumed to be secondary to the acquisition, whether of other languages (such as writing), or the Brazilian Sign Language (LIBRAS), therefore, as a supplementary experience; the concept of learning for the deaf child linked to image as a didactic resource. Based on that, research and work that break with these recurrences have been investigated and thus indicate ways for the construction of a research agenda on children and deaf childhood.
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Spontaneous activity in the brain maintains an internal structured pattern that reflects the external environment, which is essential for processing information and developing perception and cognition. An essential prerequisite of spontaneous activity for perception is the ability to reverberate external information, such as by potentiation. Yet its role in the processing of potentiation in mouse superior colliculus (SC) neurons is less studied. Here, we used electrophysiological recording, optogenetics, and drug infusion methods to investigate the mechanism of potentiation in SC neurons. We found that visual experience potentiated SC neurons several minutes later in different developmental stages, and the similarity between spontaneous and visually-evoked activity increased with age. Before eye-opening, activation of retinal ganglion cells that expressed ChR2 also induced the potentiation of spontaneous activity in the mouse SC. Potentiation was dependent on stimulus number and showed feature selectivity for direction and orientation. Optogenetic activation of parvalbumin neurons in the SC attenuated the potentiation induced by visual experience. Furthermore, potentiation in SC neurons was blocked by inhibiting the glutamate transporter GLT1. These results indicated that the potentiation induced by a visual stimulus might play a key role in shaping the internal representation of the environment, and serves as a carrier for short-term memory consolidation.
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Background Patients' experience during phacoemulsification cataract surgery is an important determinant of patient's satisfaction with surgery effectiveness.Local anaesthesia could be associated with different intraoperative visual awareness because of retention of optic nerve function.Relieving the anxiety of patients arose from intraoperative visual awareness is of important clinical significance.Objective This study was to discuss the necessity of preoperative conversation and psychological counseling and to improve the quality of surgery and the satisfaction of patients.Methods One hundred and fifty-three patients who had undergone sequential phacoemulsification and intraocular lens (IOL) implantation in the same operation under local anaesthesia from October,2010 to December,2010 in Tangdu Hospital and Xi'an First People's Hospital,received a standardized questionnaire designed based on similar questionnaires from abroad and surveyed regarding their intraoperative visual experience,including light perception,their detection of color,photopsia,and their detection of the movement of the surgeon,instrument,and changes in light intensity during cataract surgery.In another survey,seventy ophthalmologists in the Xi'an area with ≥ 10 years (33) and ＜ 10 years of experience (37) participated in a questionnaire about their recognition and response to these visual experiences,designed based on the 2010 Chinese Doctors General Questionnaire.Results During the phacoemulsification and IOL implantation,27 patients (17.6％) lost light perception,98 patients (64.1％) had light perception,28 patients (18.3％) detected more than one color,25 patients (16.3％) had photopsia,49 patients (45.1％) sensed the movement of the surgeon,26 patients (17.0％) was able to see surgical instruments,11 patients (7.2％) saw the surgeon's fingers,4 patients (2.6％) saw the surgeons,65 patients (42.5％) detected changes in light intensity and 12 patients (7.8％) saw the IOL loop and others.21.4％ of the 70ophthalmologists believed these patients might have lost light perception;while 78.3％ thought these patients retained light perception.Under local anaesthesia,93.9％ of the more experienced surgeons and 75.6％ of the junior surgeons deemed that good preoperative counseling was helpful for the patients,but only 45.5％ of the more experienced surgeons and 24.3％ of the junior surgeons counseled patients regarding intraoperative visual experience.Conclusions Most patients will experience a variety of visual sensations during phacoemulsification and IOL implantation under local anaesthesia.Many ophthalmologists are aware of these conditions.Most of the ophthalmologists believe that patients suffer from fear from these intraoperative visual experiences and claim that preoperative counseling to patients can relieve that fear,but less of them communicate these possible experiences to patients.This study offers some discussions about preoperative counseling.