The study of the relationship between physical stimuli and mental phenomena. Sensation: detection of physical energy by the 5 senses. Sight (visual), hearing (auditory), taste (gustatory), smell (olfactory), touch (tactile) Process of converting an external stimulus into the central nervous system. After being transduced, our brains then organized the sensory data into meaningful concepts. Our brains piece together: what"s in our sensory field, what was there a moment ago, what we remember from our past. Perception: the ability to be aware of something through the senses. But what counts as detectable depending whom or what is doing the detecting. A dividing point between energy levels that do and do not have a detectable effect. I. e. automatic turn on when a threshold is reached. The stimulus intensity that can be detected 50% of the time. The smallest difference in the amount of stimulation that a specific sense can detect.