Perservation is when you are fixated on something or someone. The additional attributes of perservation are extended periods of time one would allocate for some topic of interest and unusual choice of this topic(unusual system of values). Unusual system of values manifests itself in giving higher prominence to one's own interests with sometimes disregard for the opinion of your peers. Then finally it must be mentioned that perservation can have not only a negative influence on the life of an individual: it can also have positive influence when employed in research or investigation as it results in particularly strong single mindedness and helps the person to avoid distractions for an elongated period of time.
Some semanting overlapping with fixation, mania, otaku, hobby, collecting.