Definition.com
Post-hypnotic suggestion (n.) is carried out awake, and the subject, unable to recall the real reason, invents a plausible one.
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Definition.com
Post-hypnotic suggestion (n.) shows the unconscious at work: told under hypnosis to open an umbrella five minutes after waking, the man did so and could give no reason.
Definition.com
Post-hypnotic suggestion (n.) proves an idea can be active and unconscious at once: the order is carried out and never itself becomes conscious.
Definition.com
Post-hypnotic suggestion (n.) is an order given under hypnosis and obeyed later by someone who does not know why, a laboratory proof of unconscious mental acts.