Monetary reward do not increase reactivated human memory, a study shows

Imagine you are studying for a test. Then the memory of the lecture needs to be kept and reactivated for the actual test. It would be nice to find ways to ensure the strength of that reactivation.
Dayan and colleagues studied the impact of monetary reward on the strength of reactivated skill memory.
They asked 36 people right-handed to tap repeatedly with their left hand 5-digit as quickly and as accuretely as possible.
They realised that monetary reward did not reinforce skill memory reactivation.
I found it surprising. I am not expert in such study but could it be that motivation left by the simple feedback is more important for skill memory reactivation? What do you think ?


Source:

• http://rdcu.be/iUAd