BioPsych - 1 General Psychology 47.101 Biological Bases of...

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Unformatted text preview: 1 General Psychology 47.101 Biological Bases of Behavior Tapping your head What does it take? Ear must pick up vibrations (Sound, primary auditory cortex in Temporal lobe ) Noise must be recognized as speech (Wernickes area, Temporal lobe) Speech translate meaning Decision time -- Do you comply with request? (Frontal lobe Association areas) Brain sends messages to your arm (Via motor cortex; Frontal lobe) Register movement (Via Somatosensory cortex; Parietal lobe) In the end.it is all Neurons that are at the basis of all the above Roadmap Smallest unit of Behavior (Micro level) Neuron Anatomy of a Neuron How Neurons work Neural impulse Neurotransmitters Psychoactive drugs Organization of Neurons into larger systems (Macro level) Central Nervous System Brain and Spinal Cord Peripheral Nervous System Why study the neuron? Everything you say, do, think, feel, sense, wish, dreameverything you are, in other wordsis a function of the activity in your nerve cells Based on the idea that with appropriate stimulation of the nerve cells in your brain, you could be made to experience anything Anatomy of the neuron Soma Dendrites Axon Terminal buttons 2 7 Main types of neurons Motor neurons (Efferent neurons) From CNS activate muscles in the body Sensory neurons (Afferent Neurons) From receptors in sense organs to central nervous system Interneurons (carry information between neurons) relay stations between sensory and motor neurons Neural impulse Neuron fires an impulse when receives signals from sense receptors stimulated by pressure, light, heat, stimulated by chemical messages from neighboring neurons This impulse is called an ACTION POTENTIAL Electrical charge charge that travels down the axon Works like the wave only with ions (charged molecules)! Neural Impulsea closer look Neuron is at REST Inside of axon more negative (-70mv) Resting potential Concentration of ions differ between inside and outside of axon This results in a polarization (difference in electrical charge) Action potential Action Potential in action http://highered.mcgraw- hill.com/sites/0072437316/student_view0/chapter45/ animations.html# Or Biological psychology CD, Chapter 2, video 5 3 Cool tangent Local Anesthetic (ex: Novocain) attach to sodium channels of the membrane, preventing sodium from entering membrane Therefore, no action potential possible in that area If applied to sensory nerves, prevent pain messages from reaching the brain We know how but when ? When? Threshold of excitation (~ -40mv) How Often?...
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This note was uploaded on 10/16/2011 for the course PSYCHOLOGY 201 taught by Professor Staff during the Fall '10 term at University of Massachusetts Boston.

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BioPsych - 1 General Psychology 47.101 Biological Bases of...

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