Oddly Wired
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motivation

You spend more time on tasks that offer no reward.

A 2006 study by Kivetz, Urminsky, and Zheng found that people persist with a task longer if they believe they are making progress, even if the progress is fake (the 'illusionary progress effect').

Kivetz, Urminsky, and Zheng (2006), Journal of Marketing Research

Your motivation is a reaction to perceived progress, not actual distance.

Where this comes from

Study
Kivetz, Urminsky, and Zheng (2006), Journal of Marketing Research
What the check found
The phenomenon is real, but the claim cites the wrong year and misattributes the 2006 source to a non-existent 1992 study.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.