The most basic and direct defense mechanism is that of projection, in which unacceptable feelings or impulses are pushed back into the unconscious.

In the defense mechanism of repression unacceptable feelings or impulses are pushed back into the unconscious. Psychoanalytic theory protection mechanism, send away concern development views, feelings and memories from awareness. Repression causes all the other defense mechanisms. This was the first defense mechanism that Freud learned and possibly the most significant. Repression is an insensible mechanism engaged by the ego to keep troubling or intimidating judgement from becoming aware. Views that are often suppressed are those that would outcome in emotional state of guilt from the sense of propriety. This is not a very positive protection in the long term since it includes forcing troubling wishes, thoughts or reminiscences into the insensible, where though hidden they will create apprehension. 

During the paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering  plants  and fishing, hunting or scavenging wild  animals. the paleolithic is characterized by the use of knapped stone tools, although at the time humans also used  wood  and bone tools.