Sensation is initiated by physical stimuli which surround and inhabit body. As stimuli impinge on receptors, neural impulses are initiated and speed along particular pathways toward destinations in brain. Throughout sensation assorted influence come in play; the intensity of stimulation, its repetitiousness, and range and mixture of the stimuli. Stimulation might be subliminal, might produce sensory adaptation, or might be less than optimal. Below, describe the phenomenon being stated in terms of concept listed after it.