Even though most Americans say they don’t trust artificial intelligence (AI), researchers have found a startling new metric that seems to show the opposite: people are more likely to buy something after reading an AI summary of online reviews than one written by a human. Yet AI hallucinated 60% of the time when queried about the products.
The team, from the University of California, San Diego (UDSD), claims this is the first study to show how cognitive biases introduced by large language models (LLMs) have real consequences on user behavior. They also say it’s the first project to measure the quantitative impact of AI influence on people.
The study, presented in December 2025 at the Proceedings of the 14th International Joint Conference on Natural Language Processing and the 4th Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics, involved several stages.
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