Figure 2G

Contributed by simone.vigano on Jan. 29, 2021

Collection: Grid-like and distance codes for representing word meaning in the human brain

Description: To test the hypothesis that a grid-like code underlies the representation of the novel semantic space, we looked for changes in BOLD signal as a function of movement direction between word meanings during a semantic comparison task. Following physiological evidence (Stensola et al. 2012; Doeller et al. 2010), we assumed that each movement direction evoked a variable activity pattern across voxels if brain regions containing grid-cells. In particular, if an underlying grid-like code exists, then the similarity of the activity patterns evoked by different movement directions should be determined by their angular distance in the 60° rotational space. We applied a multivariate approach (as in Bellmund et al. 2016; Bao et al. 2019; Viganò & Piazza 2020), correlating the predicted grid-model to the neural dissimilarity matrix obtained from each sphere of a whole-brain searchlight (see details in the paper [DOI]). Here we report the unthresholded t-map across subjects.

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