Sensation: sensation is a conscious or unconscious awareness of external or internal stimuli, perception is a conscious awareness and interpretation of sensations and is primarily a function of the cerebral cortex. (e. g. Our blood pressure is constantly being monitored, yet we do not consciously perceive this because it occurs in the medulla oblongata rather than the cerebral cortex) Types of sensation: (sensory modalities: general senses: include both somatic and visceral senses, which provide information about conditions within internal organs. (tactile, thermal, pain, and proprioception) Whole cell (taste, inner ear, vision: adaptation in sensory receptors. Adaptation: a change in sensitivity (usually a decrease) to a long-lasting stimulus: rapidly adapting receptors- pressure, touch and smell. Slowly adapting receptors- pain, body position and chemical composition of blood. Crude touch- determines only that skin contact has occurred. Discriminative touch (fine touch) - info as to size, shape and texture.