Which linguistic phenomenon is most commonly tracked by modern product review analysis algorithms to determine consumer sentiment?

In the world of language and linguistics, product reviews offer a fascinating window into how consumers communicate opinions and experiences. The linguistic patterns in these reviews have become an important area of study for companies looking to understand consumer sentiment. This poll tests your knowledge about the fascinating intersection of linguistics and product review analysis.

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Semantic prosody (the emotional associations of seemingly neutral words)
Code-switching (alternating between two or more languages)
Phonological patterns (pronunciation tendencies)
Morphological innovation (creation of new word forms)