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One might think that conscious experience is an essential part of our mental processes, but a great deal of our thinking happens outside of our awareness. The processes that belong to our cognitive unconscious are not threatening, nor are they actively suppressed. The unconscious processes are the support apparatus and the mechanisms that make the conscious experience possible. If we consciously registered every ambiguity we encountered, and spent a moment thinking how about  each ambiguity should be resolved, we would probably never get to the end of any paragraph (Baragh and Farella 2000).

I found very interesting an article about blindsight. The article was about patients that suffer from damage  to the occipital cortex, a receiving area for visual information. They aren't able to see anything  in large parts of their visual field and fail to react to visual stimuli when those appear in the affected regions. Researchers conducted experiment from 1986 to 1992 on this type of blindness. They presented particular stimuli to the patients' affected field and asked them to guess what the stimuli were (circles or squares). At first the patients complained that the task was impossible for them; but when the researcher persisted, they did venture a guess , and these guesses were unexpected accurate. It appears that these can perceive some aspects of the visual world even if they don't have concious experience of seeing.

Does perception require a conscious supervision?Does perception necessarily yield a conscious experience?