Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Psychology & Neuroscience (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-32882009000100002 |
Resumo: | Testing contexts have been shown to critically influence experimental results in psychophysical studies. One of these contexts that show important modulation of the behavioral effects of different stimulatory conditions is the separate (blocked) or mixed presentation of these stimulatory conditions. The study presents evidence that the apparent discriminabilities of two target stimuli can change according to which of these two testing contexts is used. A cross inside a ring and a vertical line inside a ring were presented as go stimuli in a go/no-go reaction time task. In one experiment, each of these stimuli was presented to a different group of volunteers and in another experiment they were presented to the same group of volunteers, randomly mixed in the blocks of trials. Similar reaction times were obtained for the two stimuli in the first experiment, and different reaction times (faster for the cross) in the second experiment. The latter result indicates that the two stimuli have different discriminabilities from the no-go stimulus; the cross having greater discriminability. This difference is however masked, presumably by the adoption of specific compensatory attentional sets, in a separate testing context. |
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Influence of separate and mixed experimental designs on reaction times to two simple visual stimulicontext effectsreaction timediscriminabilityattentional strategyTesting contexts have been shown to critically influence experimental results in psychophysical studies. One of these contexts that show important modulation of the behavioral effects of different stimulatory conditions is the separate (blocked) or mixed presentation of these stimulatory conditions. The study presents evidence that the apparent discriminabilities of two target stimuli can change according to which of these two testing contexts is used. A cross inside a ring and a vertical line inside a ring were presented as go stimuli in a go/no-go reaction time task. In one experiment, each of these stimuli was presented to a different group of volunteers and in another experiment they were presented to the same group of volunteers, randomly mixed in the blocks of trials. Similar reaction times were obtained for the two stimuli in the first experiment, and different reaction times (faster for the cross) in the second experiment. The latter result indicates that the two stimuli have different discriminabilities from the no-go stimulus; the cross having greater discriminability. This difference is however masked, presumably by the adoption of specific compensatory attentional sets, in a separate testing context.Pontificia Universidade Católica do Rio de JaneiroUniversidade de BrasíliaUniversidade de São Paulo2009-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-32882009000100002Psychology & Neuroscience v.2 n.1 2009reponame:Psychology & Neuroscience (Online)instname:Instituto Brasileiro de Neuropsicologia e Comportamento (IBNeC)instacron:PUCRJ10.3922/j.psns.2009.1.02info:eu-repo/semantics/openAccessBruder,CamilaRibeiro-do-Valle,Luiz Eduardoeng2011-01-17T00:00:00Zoai:scielo:S1983-32882009000100002Revistahttps://www.apa.org/pubs/journals/pnePRIhttps://old.scielo.br/oai/scielo-oai.phppsycneuro@psycneuro.org1983-32881984-3054opendoar:2011-01-17T00:00Psychology & Neuroscience (Online) - Instituto Brasileiro de Neuropsicologia e Comportamento (IBNeC)false |
dc.title.none.fl_str_mv |
Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli |
title |
Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli |
spellingShingle |
Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli Bruder,Camila context effects reaction time discriminability attentional strategy |
title_short |
Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli |
title_full |
Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli |
title_fullStr |
Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli |
title_full_unstemmed |
Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli |
title_sort |
Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli |
author |
Bruder,Camila |
author_facet |
Bruder,Camila Ribeiro-do-Valle,Luiz Eduardo |
author_role |
author |
author2 |
Ribeiro-do-Valle,Luiz Eduardo |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Bruder,Camila Ribeiro-do-Valle,Luiz Eduardo |
dc.subject.por.fl_str_mv |
context effects reaction time discriminability attentional strategy |
topic |
context effects reaction time discriminability attentional strategy |
description |
Testing contexts have been shown to critically influence experimental results in psychophysical studies. One of these contexts that show important modulation of the behavioral effects of different stimulatory conditions is the separate (blocked) or mixed presentation of these stimulatory conditions. The study presents evidence that the apparent discriminabilities of two target stimuli can change according to which of these two testing contexts is used. A cross inside a ring and a vertical line inside a ring were presented as go stimuli in a go/no-go reaction time task. In one experiment, each of these stimuli was presented to a different group of volunteers and in another experiment they were presented to the same group of volunteers, randomly mixed in the blocks of trials. Similar reaction times were obtained for the two stimuli in the first experiment, and different reaction times (faster for the cross) in the second experiment. The latter result indicates that the two stimuli have different discriminabilities from the no-go stimulus; the cross having greater discriminability. This difference is however masked, presumably by the adoption of specific compensatory attentional sets, in a separate testing context. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-32882009000100002 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-32882009000100002 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.3922/j.psns.2009.1.02 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Pontificia Universidade Católica do Rio de Janeiro Universidade de Brasília Universidade de São Paulo |
publisher.none.fl_str_mv |
Pontificia Universidade Católica do Rio de Janeiro Universidade de Brasília Universidade de São Paulo |
dc.source.none.fl_str_mv |
Psychology & Neuroscience v.2 n.1 2009 reponame:Psychology & Neuroscience (Online) instname:Instituto Brasileiro de Neuropsicologia e Comportamento (IBNeC) instacron:PUCRJ |
instname_str |
Instituto Brasileiro de Neuropsicologia e Comportamento (IBNeC) |
instacron_str |
PUCRJ |
institution |
PUCRJ |
reponame_str |
Psychology & Neuroscience (Online) |
collection |
Psychology & Neuroscience (Online) |
repository.name.fl_str_mv |
Psychology & Neuroscience (Online) - Instituto Brasileiro de Neuropsicologia e Comportamento (IBNeC) |
repository.mail.fl_str_mv |
psycneuro@psycneuro.org |
_version_ |
1754821072253878272 |