Psychcentral passes along a fascinating study:

Previous research has shown that people spend more physical effort in a demanding physical task when they could gain a high-value monetary reward, than when they could gain a low-value reward. But the intriguing finding from this research was that this behavior occurred even when the monetary reward was presented subliminally, below the threshold of our conscious awareness. In other words, a person would work harder for more money, even if they weren’t consciously aware that more money was the reward.

We want to hear what you think about this article. Submit a letter to the editor or write to letters@theatlantic.com.