Be(a)ware of spider! An attentional blink study on fear detection.
Arch Ital Biol
; 147(3): 95-103, 2009 Sep.
Article
em En
| MEDLINE
| ID: mdl-20014655
ABSTRACT
We investigated whether detection of fearful stimuli is independent from attention by using an iconic version of the Attentional Blink Task in arachnophobic individuals. A colored animal icon (Target) and a black spider or butterfly icon (Probe) appeared in close temporal proximity within a stream of distractors, at one of 4 possible time lags. In one task, Probe detection was required; in another one, Target identification was also requested. In this case, competition for attentional resources produces the so-called AB effect, that is the decrease of Probe perception as a function of lag. During spider-Probe detection, arachnophobics showed a reduced AB effect with respect to the butterfly-Probe session. Their spider detection scores were also greater than ratings obtained by non-phobic controls with both Probe types. Thus, fear appears to enhance the probability of consciously perceiving the stimulus even when attention is engaged by a previous demanding event. One may assume that spider-Probe is scarcely attention demanding because detection of threat in arachnophobics is increased by rapid amygdala activation of visual areas and/or facilitated by a strong arousal-induced noradrenergic cortical input. Alternatively, an attention capturing mechanism involuntary triggered by the phobic meaning of the stimulus could be hypothesized.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Transtornos Fóbicos
/
Atenção
/
Intermitência na Atenção Visual
/
Medo
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Animals
/
Female
/
Humans
/
Male
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article