Intracranial EEG evidence of functional specialization for taxonomic and thematic relations

The dual-hub account posits that the neural organization of semantic knowledge is segregated by type relation with anterior temporal lobe (ATL) specializing for taxonomic relations and inferior parietal lobule (IPL) thematic relations. This study critically examined this recording intracranial EEG from an array depth electrodes within ATL, IPL, two regions control network, frontal gyrus (IFG) posterior middle (pMTG), while 17 participants refractory epilepsy completed a relatedness judgment task. We observed significant difference between types in ATL IPL approximately 600–800 ms after trial presentation, no differences IFG or pMTG. Within time window, alpha theta suppression indexing cognitive effort memory retrieval was trials trials. These results suggest specialization consistent cognition.