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	Provedor de dados BJMBR (2) Autor Bueno,V.F. (1) Nogueira,R.M.T.B.L. (1) Oliveira,A.B. (1) Ribeiro-do-Valle,L.E. (1) Santos,N.A. (1) Simas,M.L.B. (1) Mais... Palavra-chave Visual form processing (2) Auditory temporal processing (1) Contrast sensitivity (1) Expectancy (1) Forced-choice method (1) Priming (1) Radial frequency (1) Reaction time (1) Time course (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Info:eu-repo/semantics/other (1) Ano 2012 (1) 2006 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Mesopic radial frequency contrast sensitivity function for young and older adults BJMBR Santos,N.A.; Oliveira,A.B.; Nogueira,R.M.T.B.L.; Simas,M.L.B.. The objective of the present study was to determine contrast sensitivity curves of concentric circular patterns with radial frequencies of 0.25, 0.5, 1.0, 2.0, and 4.0 cycles per degree in young and older adult volunteers. These parameters were also compared with sensitivity contrasts for sine-wave gratings. All participants had normal acuity vision and were free of identifiable ocular illness. Contrast sensitivity was measured in 6 young adults aged 19 to 23 years and 6 older adults aged 60 to 69 years using the psychophysical forced-choice method. In this paradigm the volunteers had to decide which of two stimuli contained the above radial frequencies at low contrast levels. The other neutral stimulus was gray with homogeneous luminance. We detected a... Tipo: Info:eu-repo/semantics/other Palavras-chave: Visual form processing; Radial frequency; Contrast sensitivity; Forced-choice method. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000600012 Facilitatory effects of an auditory warning stimulus in a visual location identification task and a visual shape identification task BJMBR Bueno,V.F.; Ribeiro-do-Valle,L.E.. The occurrence of a weak auditory warning stimulus increases the speed of the response to a subsequent visual target stimulus that must be identified. This facilitatory effect has been attributed to the temporal expectancy automatically induced by the warning stimulus. It has not been determined whether this results from a modulation of the stimulus identification process, the response selection process or both. The present study examined these possibilities. A group of 12 young adults performed a reaction time location identification task and another group of 12 young adults performed a reaction time shape identification task. A visual target stimulus was presented 1850 to 2350 ms plus a fixed interval (50, 100, 200, 400, 800, or 1600 ms, depending on the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Expectancy; Time course; Priming; Auditory temporal processing; Visual form processing; Reaction time. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012001100007 Registros recuperados: 2 Primeira ... 1 ... Última

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