Relative contribution of expectancy and immediate arousal to the facilitatory effect of an auditory accessory stimulus
Braz. j. med. biol. res
;
37(8): 1161-1174, Aug. 2004. graf
Artigo
em Inglês
| LILACS
| ID: lil-362560
ABSTRACT
An auditory stimulus speeds up a digital response to a subsequent visual stimulus. This facilitatory effect has been related to the expectancy and the immediate arousal that would be caused by the accessory stimulus. The present study examined the relative contribution of these two influences. In a first and a third experiment a simple reaction time task was used. In a second and fourth experiment a go/no-go reaction time task was used. In each of these experiments, the accessory stimulus preceded the target stimulus by 200 ms for one group of male and female volunteers (G Fix). For another group of similar volunteers (G Var) the accessory stimulus preceded the target stimulus by 200 ms in 25 percent of the trials, by 1000 ms in 25 percent of the trials and was not followed by the target stimulus in 50 percent of the trials (Experiments 1a and 1b) or preceded the target stimulus by 200 ms in 6 percent of the trials and by 1000 ms in 94 percent of the trials (Experiments 2a and 2b). There was a facilitatory effect of the accessory stimulus for G Fix in the four experiments. There was also a facilitatory effect of the accessory stimulus at the 200-ms stimulus onset asynchrony for G Var in Experiments 1a and 1b but not in Experiments 2a and 2b. The facilitatory effects observed were larger in the go/no-go task than in the simple task. Taken together, these results suggest that expectancy is much more important than immediate arousal for the improvement of performance caused by an accessory stimulus.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Nível de Alerta
/
Tempo de Reação
/
Atenção
/
Percepção Auditiva
/
Estimulação Acústica
Limite:
Adolescente
/
Adulto
/
Feminino
/
Humanos
/
Masculino
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
2004
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Universidade de São Paulo/BR
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