Representation of motion concepts in occipitotemporal cortex: fMRI activation, decoding and connectivity analyses

Abstract

AbstractEmbodied theories of semantic cognition predict that brain regions involved in motion perception are engaged when people comprehend motion concepts expressed in language. Left lateral occipitotemporal cortex (LOTC) is implicated in both motion perception and motion concept processing but prior studies have produced mixed findings regarding which parts of this region are engaged by motion language. We scanned participants performing semantic judgements about sentences describing motion events and static events. We performed univariate analyses, multivariate pattern analyses (MVPA) and psychophysiological interaction (PPI) analyses to investigate the effect of motion on activity and connectivity in different parts of LOTC. In multivariate analyses that decoded whether a sentence described motion or not, the whole of LOTC showed above-chance level performance, with performance exceeding that of other brain regions. Univariate ROI analyses found that the middle part of LOTC was more active for motion events than static ones. Finally, PPI analyses found that when processing motion events, the middle and posterior parts of LOTC, overlapping with motion perception regions, increased their connectivity with cognitive control regions. Taken together, these results indicate that the whole of the LOTC responds differently to motion vs. static event descriptions, and that these effects are most pronounced in more posterior sites. These findings are consistent with embodiment accounts of semantic processing, and suggest that understanding verbal descriptions of motion engages areas of the occipitotemporal cortex involved in perceiving motion.