Residue
Many times one may notice a place where trauma has been, such as a suicide, a person was murdered, or there is depression, just how heavy and sad that place will feel. This is called astral and etheric residue, and many of us already sense and feel when that kind of negativity is present. Thoughts and emotions are things, and leave energetic imprints and residue in everything. To an unconscious person, they pick up on these external energies and think it is coming from inside themselves. Many times the person will act out the same energetic pattern without even knowing about it.
References
Term first found: Page 42, HGS Manual