Discourse Processing

Discourse processing extends language comprehension beyond the sentence to examine how we understand connected text and conversation. Understanding a story, following a lecture, or participating in a conversation requires building a coherent mental model that integrates information across sentences, draws inferences, tracks referents, and maintains thematic coherence. These processes go well beyond syntax and semantics to engage world knowledge, pragmatic reasoning, and memory.

Key Structures

• Prefrontal cortex — The anterior portion of the frontal lobe, critical for executive functions including planning, decision-making, working memory, and cognitive control.
• Right hemisphere
• Temporal-parietal junction — The junction of temporal and parietal cortex involved in theory of mind, attentional reorienting, and social cognition.
• Default mode network — A network of brain regions active during rest, mind-wandering, and self-referential thought — deactivated during demanding external tasks.
• Language Comprehension — The cognitive processes by which listeners and readers extract meaning from linguistic input, integrating phonological, syntactic, semantic, and pragmatic information in real time.
• Long-Term Memory — The vast, relatively permanent storage system that holds knowledge, experiences, skills, and facts for periods ranging from minutes to a lifetime.
• Semantics — The study of meaning in language — how words, phrases, and sentences convey meaning, and how the mental lexicon organizes and represents meaning.
• Syntax — The system of rules governing how words combine to form phrases and sentences — the grammar that enables the infinite generative capacity of human language.

Key Functions

Construct coherent mental representations from extended texts or conversations through inference generation, coherence monitoring, and situation model building.

Situation Models

Van Dijk and Kintsch (1983) proposed that discourse comprehension produces representations at three levels: the surface level (exact words and syntax), the textbase (the propositions explicitly stated), and the situation model (a mental model of the described situation). The situation model integrates text information with the reader's world knowledge to represent the characters, spatial setting, temporal sequence, causal relationships, and emotional content of the discourse. It is the situation model that supports deep understanding and long-term memory for text content.

Inference Generation

Much of what we understand from discourse is not explicitly stated but must be inferred. Bridging inferences connect adjacent sentences ("Mary threw a ball at the window. The glass shattered" requires inferring that the ball broke the window). Elaborative inferences embellish the representation with likely details. Causal inferences establish cause-effect relationships. Predictive inferences anticipate upcoming events. The extent and timing of inference generation during reading has been intensively studied using reading time and ERP measures.

Disorders

• Right hemisphere damage (discourse-level deficits)
• Traumatic brain injury — Brain damage caused by external mechanical force — from concussions to severe injuries — producing cognitive, emotional, and behavioral consequences that illuminate brain-cognition relationships.
• Autism (pragmatic difficulties)