Three experiments investigated memory for semantic information with the goal of determining boundary conditions for the manifestation of semantic auditory distraction.Irrelevant speech disrupted the free recall of semantic category-exemplars to an equal degree regardless of whether the speech coincided with presentation or test phases of the task (Experiment 1) and occurred regardless of whether it comprised random words or coherent sentences (Experiment 2). The effects of background speech were greater when the irrelevant speech was semantically related to the to-be-remembered material, but only when the irrelevant words were high in output dominance (Experiment 3). The implications of these findings in relation to the processing of task material and the processing of background speech is discussed.Keywords: Semantic Auditory Distraction, Selective Attention, Interference-by-process,
Semantic-Category Clustering RUNNING HEAD: BOUNDARIES OF SEMANTIC DISTRACTION 3There is something special about to-be-ignored background speech. For instance, natural speech is more detrimental to reading comprehension than reversed speech (Oswald, Tremblay, & Jones, 2000) and natural speech is more detrimental to memory of prose than aircraft noise (Sörqvist, 2010). Moreover, background conversation is often a source of complaint, annoyance and self-reported distraction (Evans & Johnson, 2000;Sundstrom, Town, Rice, Osborn, & Brill, 1994;Witterseh, Wyon, & Clausen, 2004).With the exception of its effect on serial short-term memory (Buchner, Irmen, & Erdfelder, 1996;Jones & Macken, 1993;Jones, Madden, & Miles, 1992;Jones, Miles, & Page, 1990;Marsh, Hughes, & Jones, 2008, 2009, speech is invariably the most distracting type of background sound (Marsh & Jones, 2010;Sörqvist, 2010), especially when the task entails processing of meaning (Beaman, 2004;Bell, Buchner, & Mund, 2008;Jones et al., 1990;Marsh, Hughes, & Jones, 2008, 2009Marsh, Beaman, Hughes, & Jones, 2012;Martin et al., 1988;Neely & LeCompte, 1999;Oswald, Tremblay, & Jones, 2000;Sörqvist, Marsh, & Jahncke, 2010;Sörqvist, Nöstl, & Halin, 2012). For instance, recall of a visually-presented list of items taken from the same semantic category (e.g., Fruit) is more impaired when categorically related items (e.g., other Fruit) are spoken in the background in comparison with categorically unrelated items (e.g., Tools). This between-sequence semantic similarity effect is easily replicable (e.g., Sörqvist et al., 2010). However, it appears to necessitate a task instruction that permits and emphasises processing of meaning. The effect is readily observed when the requirement is to free recall to-be-remembered items but fails to materialise when the task instruction emphasises recall in serial order whereby, in contrast to free recall, the processing of meaning plays a much more RUNNING HEAD: BOUNDARIES OF SEMANTIC DISTRACTION 4 subservient role see also Marsh, Vachon, & Jones, 2008). Although effects of the semantic similarity between the to-be-ignored background speech and t...