Phonological and visual distinctiveness effects in syllogistic reasoning: Implications for mental models theory

The influence of categorical organization on verbal working memory

The aim of this study was to show the positive effects of categorical organization on verbal working memory (WM), in a modified version of a double task, such as the Listening Span Test (LST) (Daneman & Carpenter, 1980). Two experiments were performed comparing sentences with the typical definitional format (i.e., superordinate term, copula, and specification) to sentences simply describing objects or events. The results of the two experiments, with participants from children aged 6 to adults, revealed that word recall was better in Categorical sentences than in Descriptive sentences and are interpreted in terms of retrieval facilitation, due to pre-existing organization in semantic memory, at least from the age of 8 onwards. Recall performance was also better with sentences giving True statements than those giving False statements. Furthermore, Categorical False sentences are more effective in enhancing recall than Descriptive False sentences since they violate well-established semantic expectations. Such variables were also found to act among participants with a lower WM span, by this confirming that pre-existing organized information may compensate for less efficient WM.

Odour-based context reinstatement effects with indirect measures of memory: the curious case of rosemary

Previous studies examining environmental context-dependent memory (ECDM) effects using indirect measures of memory have produced inconsistent findings. We report three experiments that examined ECDM in an indirect memory paradigm (word-fragment completion) using ambient odours as environmental contexts. Expt 1 manipulated the odour present at learning and testing (rosemary or lemon) to produce reinstated-context or switched-context conditions. Reinstating rosemary led to a striking ECDM effect, indicating that indirect memory testing can be sensitive to ECDM manipulations. Odour ratings also indicated that rosemary induced a more unpleasant mood in participants than lemon. Expt 2 assessed the influence on indirect retrieval of odour-based mood induction as well as odour distinctiveness, and indicated that rosemary's capacity to promote ECDM effects appears to arise from an additive combination of its unpleasantness-inducing properties and its distinctiveness. Expt 3 partially supported these proposals. Overall, our findings indicate that some odours are capable of producing ECDM effects using indirect testing procedures. Moreover, it appears that it is the inherent proprieties of odours on dimensions such as unpleasantness and distinctiveness that mediate the emergence of ECDM effects, thereby explaining the particular potency of rosemary's mnemonic influence when it is reinstated.