FACILITATION, a term used in neurology to designate the favourable influence exerted over a conduction path by the passage of an impulse having an identical end-effect with the impulse favoured. This facilitation of one nerve impulse by another may be successive or simultaneous. Activation of any reflex path leaves that path in a more favourable "set" for subsequent repeti tions of the same response. Subliminal stimuli, simultaneously applied, may facilitate one another sufficiently to produce an overt response, if these impulses are allied in a final common path. Facilitation probably occurs at the synapse. The facilitating influence exercised by one impulse on another is generally known as "bahnung." See C. S. Sherrington, Integrative Action of the Nervous System.