A capacity theory of comprehension: individual differences in working memory

Area of Science:

• Cognitive Psychology
• Psycholinguistics
• Computational Linguistics

Background:

• Working memory is crucial for language comprehension, but the precise mechanisms by which its capacity constrains understanding are not fully elucidated.
• Individual differences in working memory capacity are known to correlate with variations in cognitive abilities, including language processing.

Purpose of the Study:

• To propose a theoretical framework explaining how working memory capacity limits language comprehension.
• To investigate the role of activation in mediating processing and storage within working memory during language tasks.
• To account for individual differences in language comprehension based on working memory capacity.

Main Methods:

• Development of a theoretical model positing that activation underlies both processing and storage in working memory.
• Instantiation of the theory as a production system model to simulate comprehension dynamics.
• Analysis of how varying activation levels in the model impact adaptation to computational and storage demands.

Main Results:

• The proposed theory suggests that working memory capacity, mediated by activation, varies among individuals.
• Larger working memory capacity facilitates the integration of syntactic and pragmatic information, challenging syntactic modularity.
• Individuals with higher capacity can maintain multiple interpretations, aiding in the resolution of syntactic ambiguity.

Conclusions:

• Working memory capacity significantly impacts language comprehension by modulating the integration of different linguistic information types.
• The proposed activation-based model provides a computational account for how working memory limitations affect comprehension performance.
• Individual differences in working memory capacity explain variations in syntactic processing and ambiguity resolution in adults.