Ferenczi discovered that dreams have a traumatolytic function. Shortly afterwards, Freud described how traumas have two sides, positive and negative. This marked the beginning of a whole field of research into the negative. Alongside the analyst's formal regression, dreams provide privileged access to early traumas. The retrogressive path of thought is a gateway to memory without recollection. A clinical example of a psychotic patient treated with individual psychodrama within a group illustrates this hypothesis.