Introduction to the Nervous System
Level Beginning To Advance Introduction to the Nervous System The world is mostly unknown. This statement immediately emphasizes the point that we are not conscious of most of the environmental events that occur around us. The world consists of stimuli of which we may or may not be aware. These stimuli are pressure variations, chemicals, electromagnetic radiation, temperature, and even gravity. Figure 1.1 emphasizes this situation. This world of ours contains many events we do not focus on but also some we simply cannot perceive. We process the sensory information we interpret automatically each moment. However, we overlook many interesting aspects of our existence. For example, there are different types of pain. If you pause and think about it, you can recognize this. Remember the day you bumped your head. The immediate pain, sharp and crisp, was followed by a duller but still acutely painful ache and throb. You may even recall being told to “rub it, it’ll feel better.” The light rub...