CRT computer screens ('Cathode Ray Tube') allow for the very brief presentation of visual stimuli (in the order offor 6-7
milliseconds); with an appropriately adapted mask, this technique makes it possible to produce subliminalthis technique produces priming
at an objective detection threshold, that is to say with the presentation of strictly unconscious stimuli. Subliminal priming,
then, allows  the experimental study of the dynamic organization of unconscious psychodynamics. Current investigations focus on: (1)
the unconscious processing of stimuli withinalong primary versus secondary processes principles, (2) the unconscious processing of
linguistic stimuli using along the principles of the 'word presentation' or the signifierd, (3) the displacement and condensation
mechanisms in free association.