The reticular activating system is the attention center of the brain and center for motivation. A complex collection of neurons serve as a point of convergence as signals from the external world to the interior environment. This system is capable of generating dynamic effects on the activity of the frontal lobes, cerebral cortex, and motor activity centers of the brain... displayed 300 characters
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Research in genetics has shown that ADD and ADHD are genetically related, an imbalance in chemicals that regulate the efficiency with which the brain controls behavior. Also, ADD and ADHD may be acquired through various conditions that may cause damage to the brain. During pregnancy and child birth these may include the use of drugs during a pregnancy, toxemia, and prematurity... displayed next 300 characters
placebo effect- expectations affecting what happens to us/central nervous system-brain and spinal cord/peripheral system-nerve cells/neuron-nerve cells that communicate w/ eachother/synapse-junction between axon terminals of one neuron&the dendrites of another neuron/neurotransmitters- chemical messenger that carries impulses across
the synaptic gaps between neurons/autonomic system-heartbeat breathing/thalmus-controls sensory stimulation/hypothalamus-regulates body temps,storage of nutrients&various aspects of motivation/amygdala-moral?nical decisions(super ego)/ ID-hypothalamus ego-thalamus s ego-amygdala/EEG-electroencephalogram,shows brain waves/MRI-magnetic resonance imaging,place person in strong magnetic field,shows brain energy/CAT-computerized axial tomography,x-rays passed through head,shows density of different areas/endocrine system-glands that secrete hormones into the blood stream/hormone by pituitary gland-oxytocin/hormone by thyroid gland-thyroxin/hormone by adrenal gland-adrenaline/sensation-stimulation of sensoryreceptors/perception-we interpret sensory stimulation/absolute threshold-weakest threshold-smallest/signal detection-become more sensitive to weak stimuli/pupil-lets light into your eye,lens-adjusts to the distance by changing its thickness,retina-images are protected onto it,has neurons/parts of the ear-cochlea-contains fluid&neurons that move in response to vibrations,auditory-nerve connects to the brain,hammer,anvil,stirrup-bones in the middle ear/olfactory nerve-smell receptors that send signals to the brain/taste-bitter sour sweet salty/sensors-pain pressure temp/depth perception-binocular disperity...
Limbic System ? The limbic system is a group of brain areas involved in emotional reactions and motivated behavior.
9. Amygdala - The amygdale is responsible for evaluating sensory information to determine its emotional importance and contributing to the decision to approach or withdraw from a person or situation...
without this arousal, the cortex remains unaware of stimulation and cannot interpret sensory Information or carry on thought processes. Thus, decreased activity in the reticular formation results in sleep...
The sympathetic nervous system arouses you for defensive action by accelerating heartbeat, slowing digestion, raising blood sugar, dilating arteries, cooling you with perspiration, and making you alert and ready for action...
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