Refractory effects in picture naming as assessed in a semantic blocking paradigm

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In the cyclic semantic blocking paradigm participants repeatedly name sets of objects with semantically related names ( homogeneous sets ) or unrelated names ( heterogeneous sets ). The naming latencies are typically longer in related than in unrelated sets. In Experiment 1 we replicated this semantic blocking effect and demonstrated that the effect only arose after all objects of a set had been shown and named once. In Experiment 2, the objects of a set were presented simultaneously (instead of on successive trials). Evidence for semantic blocking was found in the naming latencies and in the gaze durations for the objects, which were longer in homogeneous than in heterogeneous sets. For the gaze-to-speech lag between the offset of gaze on an object and the onset of the articulation of its name, a repetition priming effect was obtained but no blocking effect. Experiment 3 showed that the blocking effect for speech onset latencies generalized to new, previously unnamed lexical items. We propose that the blocking effect is due to refractory behaviour in the semantic system.

Document Type: Research Article


Affiliations: 1: The University of Birmingham, Birmingham, UK 2: University of Bristol, Bristol, UK

Publication date: May 1, 2005

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