The behavioral inhibition system (BIS) is the neurological substrate of trait anxiety and is linked to the development of anxiety disorders. Three experiments are reported that investigate the moderating influence of the BIS on one pathway to fear: threat information. In all studies, children were given verbal information about a set of novel animals and their BIS sensitivity was measured. The results suggest that BIS sensitivity (1) facilitates attentional biases to stimuli associated with threat information; and (2) facilitates behavioral avoidance of novel stimuli associated with threat information. This suggests a possible mechanism through which the behavioral inhibition system may promote the acquisition of animal fears.
3The Behavioral Inhibition System and the Verbal Information Pathway to Children's Fears Rachman (1977) proposed that fears could be acquired through three pathways: direct negative conditioning experiences, learning through observing others, and fear transmitted through verbal information. Retrospective studies have shown support for all three pathways (see King, Gullone & Ollendick, 1998;Merckelbach, De Jong, Muris & van den Hout, 1996 for reviews), however, the information pathway remains the least experimentally studied. AlthoughRachman did not formalize a mechanism through which fear information would have an effect, modern theories of fear development are intrinsically linked to the verbal information pathway.Davey (1997) has pointed out that there are two roles for moderating factors in conditioning models of fear acquisition. The first is through creating expectancies about the likely outcome of an encounter with a conditioned stimulus, CS (expectancy evaluations). The second is through moderating the aversiveness of the unconditioned stimulus (US) or US representation (US Revaluation processes). Threat information could affect both processes by (1) creating expectancies or beliefs about likely outcomes of subsequent conditioning episodes and (2) by revaluing a previously innocuous experience such that its mental representation comes to act as a negative US. In terms of expectancy evaluations, Davey (1997) noted a body of conditioning research suggesting that the core CS-US association driving acquired fear responses in humans is influenced by existing beliefs about the likely outcome of interacting with the CS. For example, a child believing that a dog will bite her who is subsequently bitten will have a stronger dogtrauma association than a child for whom the bite conflicts with their prior assumptions (see Field, in press).Although retrospective studies have shown that threat information contributes to the development of fears, these reports will be prone to memory bias and forgetting of potentially important learning episodes (see King, Gullone & Ollendick, 1998;Merckelbach, De Jong, Muris & Van den Hout, 1996 for reviews). Field, Argyris & Knowles (2001) have developed an experimental paradigm for looking at the effects of fear information in the development of ani...