Cns Stock Quotes

Sensory Processing Disorder is difficulty in the way the brain takes in, organizes and uses sensory information, causing a person to have problems interacting effectively in the everyday environment. Sensory stimulation may cause difficulty in one’s movement, emotions, attention, or adaptive responses. SPD is an umbrella term covering several distinct disorders that affect how the child uses his senses. Having SPD does not imply brain damage or disease, but rather what Dr. Ayres called “indigestion of the brain,” or a “traffic jam in the brain.” Here is what may happen: • The child’s CNS may not receive or detect sensory information. • The brain may not integrate, modulate, organize, and discriminate sensory messages efficiently. • The disorganized brain may send out inaccurate messages to direct the child’s actions. Deprived of the accurate feedback he needs to behave in a purposeful way, he may have problems in looking and listening, paying attention, interacting with people and objects, processing new information, remembering, and learning.

The vestibular system tells us about up and down and whether we are upright or not. It tells us where our heads and bodies are in relation to the earth’s surface. It sends sensory messages about balance and movement from the neck, eyes, and body to the CNS for processing and then helps generate muscle tone so we can move smoothly and efficiently. This sense tells us whether we are moving or standing still, and whether objects are moving or motionless in relation to our body. It also informs us what direction we are going in, and how fast we are going. This is extremely useful information should we need to make a fast getaway! Indeed, the fundamental functions of fight, flight, and foraging for food depend on accurate information from the vestibular system. Dr. Ayres writes that the “system has basic survival value at one of the most primitive levels, and such significance is reflected in its role in sensory integration.” The receptors for vestibular sensations are hair cells in the inner ear, which is like a “vestibule” for sensory messages to pass through. The inner-ear receptors work something like a carpenter’s level. They register every movement we make and every change in head position—even the most subtle. Some inner-ear structures receive information about where our head and body are in space when we are motionless, or move slowly, or tilt our head in any linear direction—forward, backward, or to the side. As an example of how this works, stand up in an ordinary biped, or two-footed, position. Now, close your eyes and tip your head way to the right. With your eyes closed, resume your upright posture. Open your eyes. Are you upright again, where you want to be? Your vestibular system did its job. Other structures in the inner ear receive information about the direction and speed of our head and body when we move rapidly in space, on the diagonal or in circles. Stand up and turn around in a circle or two. Do you feel a little dizzy? You should. Your vestibular system tells you instantly when you have had enough of this rotary stimulation. You will probably regain your balance in a moment. What stimulates these inner ear receptors? Gravity! According to Dr. Ayres, gravity is “the most constant and universal force in our lives.” It rules every move we make. Throughout evolution, we have been refining our responses to gravitational pull. Our ancient ancestors, the first fish, developed gravity receptors, on either side of their heads, for three purposes: 1) to keep upright, 2) to provide a sense of their own motions so they could move efficiently, and 3) to detect potentially threatening movements of other creatures through the vibrations of ripples in the water. Millions of years later, we still have gravity receptors to serve the same purposes—except now vibrations come through air rather than water.

With the most complex brain in the animal kingdom, humans have the most complex nervous system. Its main task is to process sensations. The nervous system has three main parts, working in harmony. One is the peripheral nervous system, running through organs and muscles, such as the eyes, ears, and limbs. The second part is the autonomic nervous system, controlling involuntary functions of heart rate, breathing, digestion, and reproduction. The third part is the central nervous system (CNS), consisting of countless neurons, a spinal cord, and a brain.