PSYC 532 Lecture 8: Psyc 532 W10-L2- Semantic Mapping of Cortex lecture
23 Jan 2018
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Psyc 532: lecture 18 semantic mapping of the cortex. Related concepts as living things tools food shelter. No comprehensive analysis of how semantic info is represented across the whole system. Data-driven approach to model brain responses elicited by naturally spoken narrative stories containing many different semantic domains. 7ss listened to > 2 hours of stories from the moth radio hour while whole-brain blood-oxygen-level-dependent (bold) responses were recorded by fmri. Voxel-wise modeling to estimate semantic selectivity of each voxel (3-d pixel) Participants listened to stories for over 2 hours. Voxel wise model estimation, mapped on to the space: words in the same semantic domain share more features. Because of this they made a regression model for each voxel, describing how voxels would respond then did co-ocurrence to modulate regression. Co-occurrence was found between each word in the stories and 986 common words.
