perception

definition: 
Awarenes;s of something through the senses;The ability to see, hear, or become aware of something through the senses
sentence: 
Part of the explanation is psychological: Pain perception is made much worse by worry, fear or the expectation of pain, he notes. Sharpen visual perception and increase ability to estimate accurately.
difficulty: 
easy
toefl frequency: 
2
toefl classification: