Accessing world knowledge: evidence from N400 and reaction time priming

Area of Science:

• Cognitive Psychology
• Neuroscience
• Linguistics

Background:

• Understanding the speed of accessing world knowledge is crucial for cognitive models.
• Previous models often focus on associative or categorical relationships, potentially overlooking script-based knowledge.

Purpose of the Study:

• To investigate the time course of accessing conceptual script information.
• To determine if script priming occurs in the visual modality and how it integrates with context.
• To challenge existing semantic priming models by demonstrating the immediate access of script knowledge.

Main Methods:

• Two experiments using event-related brain potentials (ERPs).
• Experiment 1: Lexical decision task with word triplets (script-related vs. unrelated).
• Experiment 2: Plausibility judgment task to emphasize meaning integration, with directed attention to script relations.

Main Results:

• Facilitation for script-related triplets (faster reaction times, fewer errors) in Experiment 1.
• A significant N400-like priming effect observed for script-related triplets in both experiments.
• The N400 script priming effect's time course mirrored that of standard semantic priming.
• Enhanced N400 effect when attention was directed to script relations.

Conclusions:

• Script priming is achievable in the visual modality, indicating immediate access and integration of script information.
• Script knowledge is an integral component of word meaning.
• Findings challenge current semantic priming models, supporting a view where semantic and world knowledge are not distinctly separated.