Humans have different levels of senses to other animals. This is because we don’t need to perceive and be aware of all the things that, for example, a bat does. But for us to look at something and interpret it, we rely on processes known as sensation and perception.
Sensation is the process by which we receive and relay information transmitted as external stimuli, such as a light source. Perception is our brain’s way of interpreting this information and organising it into something that makes sense and is put into context. We understand what we see and it is our brain’s ability to do this that makes it so key to intelligent survival.
From Crash Course: Psychology on YouTube presented by Hank Green