Fear of any type shuts down higher modes of awareness and throws the brain into an ancient survival mentality. Attention and energy is shifted to the action brain layer, and the individual tends… (Pearce, Joseph Chilton. The Biology of Transcendence. VT: Park Street Press, 2002, pp 12-14, 32-34)

When you are frightened you cannot access cerebrally stored information. (Lipton, Bruce, PhD. The Biology of Belief. p 151. CA: Mountain of Love / Elite Books, 2005.)