It's not your imagination. Evidence-based speeches in Congress have been in "decline since the mid-1970s, together with a decline in legislative productivity…increasing partisan polarization in Congress and rising income inequality."
www.nature.com/articles/s41...
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Computational analysis of US congressional speeches reveals a shift from evidence to intuition - Nature Human Behaviour
This research explores the linguistic traces of evidence-based reasoning and intuitive decision-making in congressional speeches from 1879 to 2022. The analysis suggests that evidence-based language h...