單字

hone

to make an object sharp:

to make something perfect or completely suitable for its purpose:

[Example]We gradually honed our mental representation.

The song is honed to perfection. 

tingle

When you tingle with an emotion, such as excitement or fear, you feel it very strongly:

to have afeelingas if a lot ofsharppointsare being putquicklyandlightlyintoyourbody:

[Example]What about numbness or tingling?

His fingers and toes are tingling with the unknown reason. 

zero in on sb/sth

to direct all your attention towards a particular person or thing:

They can generate a number of possible movies and then zero in on the best one. 

We have to decide our channels and zero in on it. 

Summary

In all,  this demonstrated the different approaches of mental representations such as the author's writing, the researches of young musicians and doctors' diagnosis. The effective way to improve performance is to  monitor and evaluate the performance and then modify mental representation, and which is called deliberate practice. 

閱讀筆記

這段我的理解和上段一樣, 就是如何精益求精.