Individuals with anxiety disorders show deficits in the discrimination between a cue that predicts an aversive outcome and a safe stimulus that predicts the absence of that outcome. This impairment has been linked to increased spontaneous recovery of fear following extinction, however it is unknown if there is a link between discrimination and return of fear in a novel context. It is also unknown if impaired discrimination mediates the relationship between trait anxiety and either spontaneous recovery or context renewal. The (...) present study used a differential fear conditioning paradigm to examine the relationships between trait anxiety, discrimination learning, spontaneous recovery and context renewal in healthy volunteers. Fear learning was assessed using continuous ratings of US expectancy and subjective ratings of fear. Discrimination mediated the relationships between trait anxiety and both spontaneous recovery and context renewal such that elevated trait anxiety was associated with poorer discrimination, which in turn was associated with increased fear at test phases. Results are discussed in terms of the genesis and maintenance of anxiety disorders. (shrink)

Unconscious stimuli can influence participants’ motor behavior but also more complex mental processes. Recent research has gradually extended the limits of effects of unconscious stimuli. One field of research where such limits have been proposed is spatial cueing, where exogenous automatic shifts of attention have been distinguished from endogenous controlled processes which govern voluntary shifts of attention. Previous evidence suggests unconscious effects on mechanisms of exogenous shifts of attention. Here, we applied a cue-priming paradigm to a spatial cueing (...) task with arbitrary cues by centrally presenting a masked symmetrical prime before every cue stimulus. We found priming effects on response times in target discrimination tasks with the typical dynamic of cue-priming effects indicating that central symmetrical stimuli which have been associated with endogenous orienting can modulate shifts of spatial attention even when they are masked. Prime–Cue Congruency effects of perceptual dissimilar prime and cue stimuli suggest that these effects cannot be entirely reduced to perceptual repetition priming of cue processing. In addition, priming effects did not differ between participants with good and poor prime recognition performance consistent with the view that unconscious stimulus features have access to processes of endogenous shifts of attention. (shrink)

A modified version of the mere exposure effect paradigm was utilized in an implicit artificial grammar learning task in an attempt to develop a procedure that would be more sensitive in assesing nonconscious learning processes than the methods currently utilized within the field of implicit learning. Subjects were presented with stimuli generated from a finite-state artificial grammar and then had to either decide if novel items conformed to the rule structure of the grammar or rate the degree to which (...) they liked novel items. Because the latter of the task was more indirect of the two procedures, subjects′ availability to discriminate between well-formed and ill-formed items on this liking task was taken as a more sensitive piece of evidence of implicit learning, compared to performance on the rule conformity task. A subsequent test of subjects′ explicit knowledge of the rules of the grammar showed that subjects do have some conscious knowledge of the artificial grammar, but subjects making liking decisions exhibited significantly less conscious rule knowledge than subjects initially making rule-conformity judgements. The findings are discussed in relation to synergistic relationships among implicit perception, implicit memory, and implicit learning proceses. (shrink)