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After evoking a clinical case illustrating the uncoupling that takes place between the physical and psychic birth of an autistic child, the author recalls what is known about mechanisms of access to intersubjectivity that make it possible to experience the object as being exterior to the self. These mechanisms of intersubjective access are centered today around the concept of polysensorial synchronization. The final part of this work is devoted to the hypothesis postulating that some babies who experience early depression and the pain of loss may be brought to erase the object by means of sensorial desynchronization so as to avoid the risk of losing the object once again (post-depressive, pseudo-autistic mechanisms).