Forward and backward connections during combination of indifferent stimuli.
D000161:Acoustic Stimulation; D000818:Animals; D003214:Conditioning, Classical / Q000502:physiology*; D004285:Dogs; D005246:Feedback; D009949:Orientation / Q000502:physiology*; D010775:Photic Stimulation; D012018:Reflex / Q000502:physiology*