Control of attention by a peripheral visual cue depends on whether the target is difficult to discriminate
Braz. j. med. biol. res
;
39(7): 957-968, July 2006. ilus, graf
Article
Dans Anglais
| LILACS
| ID: lil-431565
RESUMO
The influence of a peripheral cue represented by a gray ring on responsivity to a subsequent target varies. When a vertical line inside a ring was a go target and a white small ring inside a ring was a no-go target, reaction time was shorter at the same location relative to a different location. However, no reaction time difference between the two locations occurred when a white cross inside the ring, instead of the white vertical line inside the ring, was the go target. We investigated whether this last finding was due to a forward masking influence of the cue, a requirement of low attention for the discrimination or a lack of attention mobilization by the cue. In Experiment 1, the intensity of the cue was reduced in an attempt to reduce forward masking. In Experiment 2, the vertical line and the cross were presented in the same block of trials so as to be dealt with a common attentional strategy. In Experiments 3 and 4, the no-go target was a 45° rotated cross inside a ring to increase the difficulty of the discrimination. No evidence was obtained that the cross was forward masked by the cue nor that it demanded less attention to be discriminated from the small ring. There was a facilitation of responsivity by the cue when the small ring was replaced by the rotated cross. The results suggest that when the discrimination to be performed is too easy the cue does not mobilize attention.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Reconnaissance visuelle des formes
/
Masquage perceptif
/
Temps de réaction
/
Attention
/
Signaux
Type d'étude:
Étude pronostique
Limites du sujet:
Adulte
/
Femelle
/
Humains
/
Mâle
langue:
Anglais
Texte intégral:
Braz. j. med. biol. res
Thème du journal:
Biologie
/
Médicament
Année:
2006
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Universidade de São Paulo/BR
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