The memories could be contacted by a bell sound, because they had the bell sound within them. Humans are not psychologically conditioned in that manner as easily as animals, because they have more awareness, which controls memories more completely. Awareness is highly corrective in minds in that it dissipates subconscious force. Therefore, sin can overtake minds through subconscious forces. The Starting Point.
Sin enters subconscious minds repeatedly creating cycles of regeneration.
So we'll analyze the starting point of a cycle. In relating to other persons, the sinner finds that a problem occurs because of his inadequacies. He isn't consciously aware of what is occurring, but he subconsciously assumes that if he could prevail against the other person, it would solve his problems. That assumption is the starting point of the conditioned response of sin. So let's look at it more detail.