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• W3200297002 endingPage "118608" @default.
• W3200297002 startingPage "118608" @default.
• W3200297002 abstract "During visual conscious perception, the earliest responses linked to signal detection are little known. The current study aims to reveal the cortical neural activity changes in the earliest stages of conscious perception using recordings from intracranial electrodes. Epilepsy patients (N=158) were recruited from a multi-center collaboration and completed a visual word recall task. Broadband gamma activity (40-115Hz) was extracted with a band-pass filter and gamma power was calculated across subjects on a common brain surface. Our results show early gamma power increases within 0-50ms after stimulus onset in bilateral visual processing cortex, right frontal cortex (frontal eye fields, ventral medial/frontopolar, orbital frontal) and bilateral medial temporal cortex regardless of whether the word was later recalled. At the same early times, decreases were seen in the left rostral middle frontal gyrus. At later times after stimulus onset, gamma power changes developed in multiple cortical regions. These included sustained changes in visual and other association cortical networks, and transient decreases in the default mode network most prominently at 300-650ms. In agreement with prior work in this verbal memory task, we also saw greater increases in visual and medial temporal regions as well as prominent later (> 300ms) increases in left hemisphere language areas for recalled versus not recalled stimuli. These results suggest an early signal detection network in the frontal, medial temporal, and visual cortex is engaged at the earliest stages of conscious visual perception." @default.
• W3200297002 created "2021-09-27" @default.
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• W3200297002 date "2021-12-01" @default.
• W3200297002 modified "2023-09-26" @default.
• W3200297002 title "Early cortical signals in visual stimulus detection" @default.
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• W3200297002 doi "https://doi.org/10.1016/j.neuroimage.2021.118608" @default.
• W3200297002 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34560270" @default.
• W3200297002 hasPublicationYear "2021" @default.
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