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Individual differences in gradients of intrinsic connectivity within the semantic network relate to distinct aspects of semantic cognition
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The influence of language dominance and domain-general executive control on semantic context effects
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Impaired emotion perception and categorization in semantic aphasia
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Intrinsic Connectivity of Anterior Temporal Lobe Relates to Individual Differences in in Semantic Retrieval for Landmarks
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Knowing what you need to know in advance : The neural processes underpinning flexible semantic retrieval of thematic and taxonomic relations
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Abstract:
Semantic retrieval is flexible, allowing us to focus on subsets of features and associations that are relevant to the current task or context: for example, we use taxonomic relations to locate items in the supermarket (carrots are a vegetable), but thematic associations to decide which tools we need when cooking (carrot goes with peeler). We used fMRI to investigate the neural basis of this form of semantic flexibility; in particular, we asked how retrieval unfolds differently when participants have advanced knowledge of the type of link to retrieve between concepts (taxonomic or thematic). Participants performed a semantic relatedness judgement task: on half the trials, they were cued to search for a taxonomic or thematic link, while on the remaining trials, they judged relatedness without knowing which type of semantic relationship would be relevant. Left inferior frontal gyrus showed greater activation when participants knew the trial type in advance. An overlapping region showed a stronger response when the semantic relationship between the items was weaker, suggesting this structure supports both top-down and bottom-up forms of semantic control. Multivariate pattern analysis further revealed that the neural response in left inferior frontal gyrus reflects goal information related to different conceptual relationships. Top-down control specifically modulated the response in visual cortex: when the goal was unknown, there was greater deactivation to the first word, and greater activation to the second word. We conclude that top-down control of semantic retrieval is primarily achieved through the gating of task-relevant ‘spoke’ regions.
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URL: https://eprints.whiterose.ac.uk/166312/
https://eprints.whiterose.ac.uk/166312/1/manuscript_NeuroImage.docx
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Control the source: Source memory for semantic, spatial and self-related items in patients with LIFG lesions ...
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Tidier descriptions of speech and language therapy interventions for people with aphasia; consensus from the release collaboration
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In: Research outputs 2014 to 2021 (2018)
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The interplay between control processes and feature relevance: Evidence from dual task methodology ...
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Who participates in aphasia research?: an analysis of the REhabilitation and recovery of peopLE with Aphasia after StrokE (RELEASE) data set
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How Does Featural Salience Affect Semantic Control Processes? A Preliminary Study
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The selective role of premotor cortex in speech perception : A contribution to phoneme judgements but not speech comprehension
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