Attention is regarded as a required condition for conscious perception, as selective attention has been considered the gateway to perceptual memory, learning, and processing. Furthermore, there is a big relationship between attention and perceptual consciousness because if attention is given to an object, the various features of such object is revealed, but once attention is shifted away from the object, the object is removed from our conscious mind.
because it effect daily life if you have crippling depression you cant really do anything because you cant function daily tasks and you can be ham to your self or others