Unit 3: Biological Bases of Behavior

Electric grids just to activate the stimulation pedal

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electric grids just to activate the stimulation pedal Humans have this limbic center for pleasure however stimulated patients only reported mild pleasures Module 12: The Cerebral Cortex Older brain functions enable memory, emotions, and basic drives Newer brain functions in the cerebrum form specialized work teams that enable our perceiving, thinking, and speaking Covering those hemispheres are the cerebral cortex - a thin surface layer of interconnected neural cells; the brain’s ultimate control and info-processing center Structure of the cortex Glial cells - cells in the nervous system that support nourish and protect neurons; they may also play a role in learning and thinking Glial cells are like worker bees and the neurons is like the queen bee By “chatting” w/ neurons they may participate in info transmission and memory Each hemispheres cortex is subdivided into four lobes separated by folds: 1. Frontal lobes - portion of the cerebral cortex lying just behind the forehead; involved in speaking and muscle movements and in making plans and judgement 2. Parietal lobes - portion of the cerebral cortex lying at the top of the head and toward the rear; receives sensory input for touch and body position 3. Occipital lobes - portion of the cerebral cortex mying at the back of the head; includes areas that receive info from the visual fields 4. Temporal Lobes - portion of the cerebral cortex lying roughly above the ears; includes the auditory areas, each receiving info primarily from the opposite ear Functions of the cortex Specific parts of the cortex do not control complex functions like movement or speech Motor functions Motor cortex - an area at the rear of the frontal lobes that controls voluntary movements Stimulating parts of this region on the left or right would cause movement on the opposite side of the body M apping the motor cortex Body areas requiring precise control, fingers and mouth occupy the greatest cortical space Brain-computer interfaces Clinical trials of cognitive neural prosthetics help ppl that are paralyzed to move They do this by implanting a chip with 100 electrodes that allow ppl to control things
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though a computer screen Sensory functions Somatosensory cortex - area at the front of the parietal lobes that registers and processes body touch and movement sensations More sensitive body regions, the larger the somatosensory cortex devoted to it The visual cortex in the back of the brain allows u to see (occipital cortex) The auditory cortex above the ears allows you to hear (temporal lobes) Association areas Association areas - areas of the cerebral cortex that are not involved in primary motor or sensory functions; rather, they are involved in higher mental functions such as learning, remembering, thinking, and speaking Association areas won't trigger any observable response These areas interpret, integrate, and act on sensory info and link it with stored memory Association areas are found in all four lobes Prefrontal cortex
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  • Fall '16
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