decussation

n. a crossing or intersection in the form of a letter X, as in the decussation of the pyramids of the medulla oblongata and of the fibers of the left and right optic nerves in the optic chiasm.

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Psychology term of the day

January 18th 2025

consistent missing

in parapsychology experiments using Zener cards or similar targets, the phenomenon in which a participant’s “calls,” or guesses, are consistently wrong or significantly below chance expectations. Some people attribute such systematic failure to processing error or a conscious or nonconscious reluctance to confirm psychic ability. See also psi-missing.