Why are you unaware of unchanging stimuli?

We become unaware of unchanging stimuli due to a phenomenon called sensory adaptation. This is a process where our sensory receptors decrease their response to constant, unchanging stimuli over time, allowing us to focus on more relevant changes in our environment. By filtering out these constant stimuli, our brains conserve cognitive resources and enhance our ability to detect new or important information. As a result, we often overlook background or repetitive sensations that don't require our immediate attention.