Abstract
This study attempted to clarify what sentences are based on an understanding of the human cognitive system. Until now, there has been a widespread understanding of whether sentences represent events in the real world or propositions that have truth-value. However, based on recent studies of cognitive psychology, brain science, and consciousness science, Sentence(utterance) is neither an event nor a proposition. An organism compares, analyzes and judges real-time sensory data input or declarative memory in the prefrontal lobe, the working memory area. Sentence is an output of such a process of speculation, inference, prediction and evaluation on the world. In order to derive these results, this paper theoretically reviewed and synthesized the achievements of brain science, consciousness science, and cognitive science so far to establish a cognitive model, and explained what sentences are based on this cognitive model.
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