Motion and actions in language: Semantic representations in occipito-temporal cortex

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Abstract

Highlights

★ We examined the nature of the representations involved in occipito-temporal cortex. ★ We focused on motion-perception area V5 and posterior temporal regions. ★ Human and object motion sentences were contrasted with their static counterparts. ★ Posterior temporal cortex, but not V5, strongly responds to animacy and motion. ★ Language recruits supra-modal event-based representations in posterior temporal cortex.

Understanding verbs typically activates posterior temporal regions and, in some circumstances, motion perception area V5. However, the nature and role of this activation remains unclear: does language alone indeed activate V5? And are posterior temporal representations modality-specific motion representations, or supra-modal motion-independent event representations? Here, we address these issues by investigating human and object motion sentences compared to corresponding state descriptions. We adopted the blank screen paradigm, which is known to encourage visual imagery, and used a localizer to identify V5 and temporal structures responding to motion. Analyses in each individual brain suggested that language modulated activity in the posterior temporal lobe but not within V5 in most participants. Moreover, posterior temporal structures strongly responded to both motion sentences and human static sentences. These results suggest that descriptive language alone need not recruit V5 and instead engages more schematic event representations in temporal cortex encoding animacy and motion.

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