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Although word production engages a frontal-temporal-parietal network, no studies have tested how lesions to temporal and parietal lobe areas that represent semantic and phonological knowledge dampen neural responses in the left pars triangularis and the left pars opercularis, two adjacent regions in the left inferior frontal gyrus implicated in word search and retrieval. Here, 52 patients with temporal lobe lesions underwent clinical functional MRI while performing the category and letter fluency tasks. We investigated where lesion presence was inversely related to the magnitude of task-specific neural responses in pars triangularis and pars opercularis using a technique referred to as voxel-based lesion activity mapping (VLAM). We found that lesions to the left anterior superior temporal gyrus, left temporal pole, left hippocampus, left insula, and underlying inferior fronto-occipital fasciculus were associated with reduced neural responses in the left pars triangularis during the category fluency task. Lesion damage to the right hippocampus was associated with reduced neural responses in the left pars opercularis during category fluency. By contrast, lesions to the left posterior superior temporal gyrus, left supramarginal gyrus, left parietal operculum, and the inferior fronto-occipital fasciculus and left arcuate fasciculus were associated with reduced neural responses in the left pars triangularis and the left pars opercularis during the letter fluency task. These results suggest that anatomically dissociable brain networks interact with the left inferior frontal gyrus when different search strategies constrain the retrieval of word representations.<\/jats:p>","DOI":"10.64898\/2026.05.20.726706","type":"posted-content","created":{"date-parts":[[2026,5,22]],"date-time":"2026-05-22T08:20:12Z","timestamp":1779438012000},"source":"Crossref","is-referenced-by-count":0,"title":["Causal dependencies between frontal and temporal lobe regions underlying word search and retrieval"],"prefix":"10.64898","author":[{"given":"Benedikt","family":"Winzer","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, University of Rochester Medical Center, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Burns","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, University of Rochester Medical Center, 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