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Interference from object part relations in spoken word production: behavioural and fMRI evidence
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Abstract:
Objects presented in categorically related contexts are typically named slower than objects presented in unrelated contexts, a phenomenon termed semantic interference. However, not all semantic relationships induce interference. In the present study, we investigated the influence of object part-relations in the blocked cyclic naming paradigm. In Experiment 1 we established that an object's parts do induce a semantic interference effect when named in context compared to unrelated parts (e.g., leaf, root, nut, bark; for tree). In Experiment 2) we replicated the effect during perfusion functional magnetic resonance imaging (fMRI) to identify the cerebral regions involved. The interference effect was associated with significant perfusion signal increases in the hippocampal formation and decreases in the dorsolateral prefrontal cortex. We failed to observe significant perfusion signal changes in the left lateral temporal lobe, a region that shows reliable activity for interference effects induced by categorical relations in the same paradigm and is proposed to mediate lexical-semantic processing. We interpret these results as supporting recent explanations of semantic interference in blocked cyclic naming that implicate working memory mechanisms. However, given the failure to observe significant perfusion signal changes in the left temporal lobe, the results provide only partial support for accounts that assume semantic interference in this paradigm arises solely due to lexical-level processes.
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Keyword:
1201 Arts and Humanities (miscellaneous); 2805 Cognitive Neuroscience; 3205 Experimental and Cognitive Psychology; 3310 Linguistics and Language; Behavioral Sciences; Experimental; Neurosciences; Neurosciences & Neurology; Psychology
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URL: https://espace.library.uq.edu.au/view/UQ:362731
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| 2 |
Feature overlap slows lexical selection: evidence from the picture-word interference paradigm
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