O estudo das cenas visuais complexas e sua relaÃÃo com a esquizofrenia

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Schizophrenia seems to be one of the most serious and complex mental disruptions of multi-factorial character (still indefinite multiple causes). This motivates several studies in neuroscience field, like the perception, to research and open pathways which can contribute with questions about its ethyology. This study aimed the use of complex visual stimulation to investigate possible alterations in visual perception, related to schizophrenia. Thus, it started from the fact that schizophrenia alters the central nervous system functioning and can act in a series of sensory disfunctions, such as delirium, promoting distortions in visual-spatial perception. The sample had 44 participants, being divided in two groups: the experimental group (EG), with 22 participants, formed by patients duly diagnosed with schizophrenia (according to CID-10) by psychiatrists of the Neuropsychiatry Ambulatory of Hospital das ClÃnicas of UFPE (Federal University of Pernambuco); and the control group (CG) by participants who had neither psychiatric disruption nor used any controlled medication. All the participants showed normal or corrected sight. Twenty-four pictures of painter Salvador Dali were used, photographed in a 10 x 15 cm dimension, which showed great diversity and disparity in size of figures represented there. All pictures were framed. Besides the photos, it was used a partitur shelf an âLâ cases (PolibrÃs cristal) to take note of the participant answers. The instruction given to the participants was standardized: to indicate which figure he/she had seen first. After the volunteer indicated the figure, the researcher put a circle around it and took its measurement with a ruler (cm). The proceedings repeated over each one of the 24 pictures. The measurement (cm) was transformed in a visual angle so that the comparision could be done for both EG and CG. The results indicated statistically significant difference (F(23,966)=12,228,p<0,000) between EG and CG. The experimental group (EG) chose figures with a visual angle averaged one and a half times bigger than the control group (CG). This difference can contribute as a differential indicator in the diagnostic hypothesis of this disruption. We suppose that people who have schizophrenia might have a disruption of visual vias that process small objects, or, more specifically, high spatial frequencies

ASSUNTO(S)

visÃo - aspectos psicolÃgicos visual scenes schizophrenia percepÃÃo perception psicologia esquizofrenia psicologia

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