Three studies examined the ubiquity of the bowed serial position effect in comparative judgments: the tendency for pairs of extreme magnitude to be discriminated more readily than pairs of intermediate magnitude. Although prior research has demonstrated that this effect occurs quite regularly in finite set experiments that repeatedly present a small number of items, there has been some ambiguity about the robustness of the bowed serial position effect in infinite set experiments, in which items are never repeated. Based on the extensive norms collected in Experiment 1, Experiment 2 demonstrated that a bowed serial position effect does in fact occur in a large infinite set experiment. The results of Experiment 3 indicate that this bowed serial position effect is not an artifact of our norms. The results are consistent with models that emphasize categorization of magnitudes and inconsistent with models that emphasize positional discriminability.

The picture-word interference (PWI) task is a widely used technique for exploring effects of semantic context on lexical access. In this task, printed words are superimposed over pictures to be named, with the timing of the interfering word relative to the picture systematically manipulated. Two experiments (N = 24 adults in each) explored the time course of effects of associates (e.g., CARROT superimposed on a picture of a rabbit) versus coordinates (e.g., CHIPMUNK superimposed on a picture of a rabbit) on naming latencies. Associates led to faster picture naming than did unrelated words, with facilitative effects occurring at stimulus onset asynchronies (SOAs, in ms) ranging from -450 to 0. Coordinates led to slower naming latencies, with the interference effect restricted to SOAs of -150 and 0. The overlapping time course of associative priming and coordinate interference provides important constraints on models of lexical access in speech production.

Three experiments used the picture-word interference task to evaluate competing models of lexical access in spoken word production. Both the presence of a part-whole relation and association between the target and the interfering word were manipulated. Part terms associated with targets produced facilitation at early stimulus onset asynchronies (SOAs; -300 ms in Experiment 1, -300 and -150 ms in Experiment 3), but not at SOA 0 ms. Otherwise, part terms tended to produce interference, with unassociated part terms producing a significant semantic interference effect (SIE) at SOA of 0 ms in Experiment 1, and a similar trend in Experiment 3. Experiment 2 replicated the materials and procedure of Costa, Alario, and Caramazza ( 2005 , Experiment 2. On the categorical nature of the semantic interference effect in the picture-word interference paradigm. Psychonomic Bulletin & Review, 12(1), 125-131), yet failed to find any semantic facilitation at SOA 0 ms. We propose that these findings are consistent with lexical competition accounts of SIE but difficult to explain in terms of the plausibility of the interfering words as responses to the target.