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2014 ; 219
(2
): 329-35
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Snake fearfulness is associated with sustained competitive biases to visual snake
features: hypervigilance without avoidance
#MMPMID24930577
Deweese MM
; Bradley MM
; Lang PJ
; Andersen SK
; Müller MM
; Keil A
Psychiatry Res
2014[Oct]; 219
(2
): 329-35
PMID24930577
show ga
The extent and time course of competition between a specific fear cue and
task-related stimuli in early human visual cortex was investigated using
electrophysiology. Steady-state visual evoked potentials (ssVEPs) were evoked
using random-dot kinematograms that consisted of rapidly flickering (8.57 Hz)
dots moving randomly, superimposed upon emotional or neutral distractor pictures.
Participants were asked to detect intervals of coherently moving dots, ignoring
the distractor pictures that varied in hedonic content. Women reporting high or
low levels of snake fear were recruited from a large sample of healthy college
students, and snake pictures served as fear-relevant distractors. The
time-varying amplitude of the ssVEP evoked by the motion detection task showed
significant reduction when viewing emotionally arousing, compared to neutral,
distractors, replicating previous studies. For high-fear participants, snake
distractors elicited a sustained attenuation of task evoked ssVEP amplitude,
greater than the attenuation prompted by other unpleasant arousing content. These
findings support a hypothesis that fear cues prompt sustained hypervigilance
rather than perceptual avoidance.