Many studies suggest that long-term lexical-semantic knowledge is an important determinant of verbal short-term memory (STM) performance. This study explored the impact of emotional valence on word immediate serial recall as a further lexico-semantic long-term memory (LTM) effect on STM. This effect is particularly interesting for the study of STM-LTM interactions since emotional words not only activate specific lexico-semantic LTM features but also capture attentional resources, and hence allow for the study of both LTM and attentional factors on STM tasks. In Experiments 1 and 2, we observed a robust effect of emotional valence on pure list recall in both young and elderly adults, with higher recall performance for emotional lists as opposed to neutral lists, as predicted by increased LTM support for emotional words. In Experiments 3 and 4 however, using mixed lists, it was the lists containing a minority of emotional words which led to higher recall performance over lists containing a majority of emotional words. This was predicted by a weak version of the attentional capture account. These data add new evidence to the theoretical position that LTM knowledge is a critical determinant of STM performance, with further, list-type dependent intervention of attentional factors.
words 3There is a substantial body of research showing that verbal short-term memory (STM) is not an autonomous cognitive function, but instead recruits linguistic knowledge bases to a very large extent. The present study explored a further potential long-term memory (LTM) effect on STM performance, the impact of emotional-semantic knowledge associated with emotional words.
The impact of verbal LTM on STMMany studies show that the linguistic properties of the words, such as lexical status, lexical frequency, phonotactic frequency, word imageability, have a direct impact on their recall probability during a STM task (Gathercole, Frankish, Pickering & Peaker, 1999;Hulme et al., 1997;Majerus & Van der Linden, 2003;Roodenrys, Hulme, Alban, & Ellis, 1994;Walker & Hulme, 1999). The most prototypical effect is the lexicality effect, characterized by higher recall performance for lists composed of familiar words, as opposed to lists composed of nonwords (e.g., Gathercole et al., 1999;Hulme, Maughan & Brown, 1991).These effects have been shown to be independent of articulatory rehearsal factors (e.g., Gathercole et al., 1999;Hulme et al., 1991). The existence of these psycholinguistic effects has been interpreted as reflecting the influence of phonological, lexical and semantic language representations stored in LTM on verbal STM (Hulme et al., 1991). On the one hand, this LTM support is supposed to function at the level of retrieval, when the decayed STM traced is reconstructed via corresponding LTM representations: the more available and familiar these representations are, the more efficient these reconstruction processes will be (the so-called redintegration process) (Hulme et al., 1997;Gathercole et al., 1999;Schweickert, 1993). Other th...