I think in order to receive information from the environment we are equipped with sense of organs such as eyes, ears, and nose. Each sense of organs is part of a sensory system which receives sensory inputs and transmits sensory information to the brain, and it somehow converted into perceptions of things into sights, sounds, smells, taste and touch experiences. However, we perceive objects in two different ways, depends on our senses and experiences. Bottom up processing is when expectation is based mental processing that influenced by our senses such as seeing, feeling, tasting, hearing and smelling. Top down processing is when expectation is based on our previous knowledge and experience that allows us to better perceive an object. When I was young, we used to have three cats at home and my mother told me a funny story about how my experience seeing a cat was. She said that as soon as I saw the cat, I started to cry and yell, “Please mommy I will be very good from now on, please don’t give me to this hairy monster.” She explained that it wasn’t a monster and it called a cat. My previous experience of what it means to be a cat help me to faster and better perceive that object as a small friendly pet with pointy ears and meows. Also, whenever I feel weird tickle or itch on my body, I started to scream and slap the spot, because it feels like some kind of nasty insect is crawling on my body. However, when I see a spider walking on my arm, I just blow it off without