The only difference between people who say they cannot perceive interdimensionally and people who consciously communicate interdimensionally is intent and practice. Most people access interdimensional information unconsciously. When they experience conscious contact with a non-human energy, they tend to pass it off as a curiosity or as intuition, or they cancel out the experience as too weird to deal with.
Atala Dorothy Toy, We Are Not Alone: A Complete Guide to Interdimensional Cooperation
communication, dimensions