Transitivity, Space, and Hand: The Spatial Grounding of Syntax

Area of Science:

• Cognitive Psychology
• Linguistics
• Neuroscience

Background:

• Research connects numerical cognition to a mental number line.
• Left-to-right orthography influences visual scene processing, favoring agent-left placement.
• A gap exists in understanding how sentence structure and semantic roles interact with spatial biases.

Purpose of the Study:

• To investigate the spatial biases evoked by transitive sentences.
• To explore the relationship between sentence position, semantic role (agent/patient), and spatial response.
• To determine the influence of hand laterality and vocalization on these spatial biases.

Main Methods:

• Four experiments using transitive sentences with diverse verbs.
• Participants read sentences and performed a probe recognition task (left/right screen presentation).
• Probe words included sentence elements (agents, patients) and control words.

Main Results:

• Consistent lateral spatial biases were observed for agents and patients.
• These biases correlated with the agent's role in the action's causal sequence, independent of mention order.
• The left hand demonstrated greater sensitivity to spatial effects compared to the right; vocal responses showed no spatial effect.

Conclusions:

• Sentence structure and semantic roles create spatial biases in cognitive processing.
• These biases are linked to the causal sequence of actions, not merely word order.
• Handedness and modality (vocal vs. manual) significantly modulate these language-driven spatial effects.