Poster A77, Saturday, March 24, 1:30–3:30 pm, Exhibit Hall C
The Role of Inter-region Information Synchrony in Processing Visual Stimuli
Heather Bruett1, Marc Coutanche1; 1University of Pittsburgh
The brain processes the many aspects of visual stimuli via the coordinated activity of a number of relevant regions. The processing targets of these regions can be uncovered by “decoding” multivoxel activity patterns, which can represent subtle distributed information. An approach that examines the timeseries of pattern discriminability – informational connectivity – can help determine which regions contain information in the same trials – in other words, which regions are acting in synchrony. I will present fMRI data that were analyzed via multivariate analysis tools and informational connectivity to determine how information synchrony plays a role in processing scenes and objects. We ask how regions within the scene and object processing networks can decode scenes and objects from “pseudo-scenes,” which contain certain elements present in typical scenes but lack other visual components. We find that the strength of informational connectivity within these networks differs based on the object or scene discriminations examined. The findings are particularly methodologically interesting, as they suggest that informational connectivity can identify functionally-relevant networks with greater specificity than can other measures, such as functional connectivity and psychophysiological interaction (PPI).
Topic Area: METHODS: Neuroimaging