Psychologist Bluma Zeignarik noticed that waiter hd trouble remembering orders after the food was delivered & the check was closed.
To test her hypothesis she conducted a series of experiments to see if preventing participants from finishing a task could impact how well they remember them.
These experiments confirmed that people tend to remember unfinished or incomplete tasks better than completed tasks.
See the full study here :
Weber, E.U. (2010). What shapes perceptions of climate change? Wiley interdisciplanary Reviews : Climate change, 1(3), 332-342, https:doi.org/10.1002/wcc.41
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