At the right-hand-side bottom corner of the photograph, you can see a heat-scale ranging from light blue to bright yellow. The sensation level is least at the bottom of the scale (blue-black) and increases as you climb higher in the scale. It is the highest when it is bright yellow.
While emotions like happiness activate almost all body parts; states like depression make the entire body dead. Emotions like anger activate, the head, chest and arms. See the photograph to know how other emotions effect your body.