This is another article in a series proposing that memory and thought in our brains consist of tachyons. During the 1970’s and later, tachyon physicists found six-dimensional special relativity with three space and three time dimensions, more suitable for the description of tachyons than the conventional four-dimensional special relativity. In six-dimensional relativity, events observable by a subluminal observer and those by a superluminal observer are located on two different four-dimensional Minkowski subspaces in the higher dimensional spacetime. If one assumes that information in the mind of a sentient observer consists of tachyons then the observer’s brain and mind play the roles respectively of a subluminal and a superluminal agent, whenever he/she observes an external material object or an internal thought, emotion, etc. Six-dimensional special relativity then implies that the space-time of the physical world and the space-time of phenomenal information of the individual are different four-dimensional Minkowski sheets embedded in the six-dimensional space-time

six-dimensional special relativity, quantum brain, tachyons, conscious and unconscious thought, material dualism, extended materialism