Despite decades of intense investigation across philosophy, psychology and neuroscience, the precise neural signatures and dynamics underlying the conscious awareness remain a significant challenge. Not to mention the attempt to delineate the different levels or states of visual awareness, or the transition between unconscious states and full conscious perception. The present study aims to investigate the neural correlates of consciousness in the time-frequency domain, as well as measuring them in the two stages of unconsciousness to characterise exclusively subliminal, preconscious and conscious states. In accordance with the most widely accepted theories supporting visual awareness, the hypotheses are as follows: firstly, the total absence or strongly reduced presence of certain patterns in the subliminal context and secondly, the presence in the preconscious state of significant variations almost superimposed on the conscious state, following the presentation of a visual stimulus.