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Unit 2 Part 1

by: Jordan Rouse

Unit 2 Part 1 PSY 101

Jordan Rouse

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About this Document

Discusses Nervous system, Brain, and Brain functions
Introductory Psychology
Andrea Friedrich
nervous system, brain, brain functions, unit 2, part 1, Psychology
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This 3 page Bundle was uploaded by Jordan Rouse on Monday February 22, 2016. The Bundle belongs to PSY 101 at University of Kentucky taught by Andrea Friedrich in Winter 2016. Since its upload, it has received 21 views. For similar materials see Introductory Psychology in Psychlogy at University of Kentucky.


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Date Created: 02/22/16
Unit 2: Brain and Behavior Neuron  Nerve cell  100 billion  Smallest part of the brain 3 main parts 1. Dendrite- branching extentions that revieve chemical messages and conduct them to the cell body 2. Cell Body (sona)- contains the neurons nucleus (with DNA) 3. Axon- take information away from the body cell to other neurons or to muscles or glands Action potential (impulse) occurs when chemicals contanct the surface of the neuron and a vrief of electrical charge travels down the axon Cell becomes more positively charged; opens other channels to release potassium  Myelin Sheath- fatty tissue that covers the axon of some neurons and helps speed neural impulses  Threshold- there is a certain level of stimulation that is required to trigger Action Potential  All or none principle- if threshold isn’t reached, action potential won’t fire; if threshold is reached, action potential will fire if same side  Synapse- junction between axon and tip of sending neuron of the dendrite of receiving neuron  Synapse gap- tiny gap at the junction  Neurotransmitters- chemical messengers that transverse the synapse gaps between neurons  Reuptake- the process by which the sending neuron reabsorbs the excess neurotransmitters Nervous System Peripheral Nervous System  Kicks to body sense receptors, muscles Central Nervous System  Brain and spinal cord- sends peripheral NS to brain o Somatic- specializes in control of voluntary movements and communication to inform argons o Autonomic- controls the parts that function involuntarily  Sympathetic- defense or “fight or flight”  Parasympathetic- relax and digest Brian 1. Control Core a. Medulla- unconscious functions b. Pons- coordinates muscles between right and left; sleep and arousal c. Cerebellum- balance, intellectual functions; time, same memory and learning d. Reticular formation- sleep arousal, attention e. Thalamjus- message from nerves to higher brain regions 2. Limbic System a. Hippocampus- memories b. Amyygdala- aggression and fear c. Hypothalamus-maintain homeostasis  Cerebral Cortex o Highest mental function such as thinking and planning o Left side controls right, vice versa o Left concentrates on speaking, reducing, reasoning o Right concentrates on pictures, recognizing music o Left: bit by bit; right : globally  Roger Sperry o 1968 o Hemisphere specialization o Corpus callosum wide brand that connects two hemisphere o Cut the cord, seziures stopped, yet specific side effects called split brain research  Each hemisphere has 4 regions o Frontal o Parietal o Temporal o Occipital 1. Motor Functions a. Fritsch and Hitzig experimented with dogs, making the move b. Wilder Penfield created map of functions by keeping patients awake during brain surgery 2. Sensory Functions a. Wilder Penfield happened the snsory cortex 3. Higher mental functions: learning remembering, thinking 4. Language a. Wernicke’- trouble understanding b. Brocas-trouble expressing themselves in speech Functions of Verebral Cortex  Frontal Lobe o Control of voluntary movement o Speaking o Personality o Making plans  Parietal Lobe o Receives sensory input for touch o Attention o Special location  Occiptical Lobe o Receives visual information  Temporal Lobe o Hearing o Language o Memory Developing After Birth  Reflexes o Rooting reflex o Sucking reflex o Ability to recognize mothers smell o Preference for 3 dimensional stimuli


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