Answer:
Human Being has a Biomagnetic field approx 1 meter in front of the body. The memories of the person are outside the body at the Biomagnetic field (Right side ). Due to a weak Biomagnetic field there are chances of getting attached with a negative field. A negative field is dead persons Biomagnetic field with the memories. This is also called as soul attachment. Due to clash in memories the person may develop depression, split personalities etc. In fact it is one of the major causes for mental illness.For more details based on my research findings