Influence of separate and mixed experimental designs on reaction times to two simple visual stimuli
Psychol. Neurosci. (impr.)
; 2(1): 3-9, June 2009. ilus, gra
Artigo
em Inglês
| Index Psicologia - Periódicos
| ID: psi-45043
Biblioteca responsável:
BR85.1
Localização: BR85.1; USP/IP/SBD / BR27.1; PUC-CAMPINAS/SBI
ABSTRACT
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.(AU)
Texto completo:
Disponível
Coleções:
Bases de dados nacionais
/
Brasil
Base de dados:
Index Psicologia - Periódicos
Assunto principal:
Estimulação Luminosa
/
Tempo de Reação
/
Percepção Visual
Limite:
Feminino
/
Humanos
Idioma:
Inglês
Revista:
Psychol. Neurosci. (impr.)
Ano de publicação:
2009
Tipo de documento:
Artigo
Instituição/País de afiliação:
Universidade de São Paulo/Brazil