Lecture - 5 - April 8th

Lecture - 5 - April 8th - STUDYING THE BRAIN: INVASIVE...

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STUDYING THE BRAIN: INVASIVE METHODS 1. Electrical Stimulation This involves directly electrically stimulating areas of the brain to see how it a f ects behavior or mental functioning. Illustration: The Homunculus PenFeld and Jaspers ( 1954 ) electrically stimulated surface of cortex in a systematic fashion. By plotting movements and sensations evoked by electrical stimulation, they found a sensory and motor map of the body on the surface of the cortex.
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1. Electrical Stimulation STUDYING THE BRAIN: INVASIVE METHODS http://www.youtube.com/watch?v=52bYneF6JEk
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1. Electrical Stimulation STUDYING THE BRAIN: INVASIVE METHODS
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2.Lesion This involves purposefully disabling a area of the brain in order to observe how it alters behavior. Lesioning of the lateral hypothalamus stopped eating ( Anand and Brobeck, 1942 ) Lesioning of the v entromedial hypothalamus produced overeating and led to obesity ( Hetherington and Ranson, 1942 ) . Illustration: Eating Behavior STUDYING THE BRAIN: INVASIVE METHODS
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3.Single - Cell Recording Illustration: Determining Response Characteristics of Cells in Visual Cortex This involves inserting a microelectrode into a speciFc region of the brain to record changes in activity of a small group of neurons as various stimuli are presented. STUDYING THE BRAIN: INVASIVE METHODS
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This involves hooking up electrodes to the scalp to monitor electrical activity of the brain over time. Electroencephalography ( EEG ) Illustration: Sleep Cycles STUDYING THE BRAIN: ELECTRICAL ACTITIVITY
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STUDYING THE BRAIN: IMAGING METHODS 1. Computerized Tomography ( CT ) Illustration: The Alcoholic Brain An imaging technique that uses two dimensional x - ray images to generate three dimensional images of the brain.
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STUDYING THE BRAIN: IMAGING METHODS 2.Positron Emission Tomography ( PET ) Illustration: Depression An imaging technique that detects a radioactive form of glucose and displays brain activity while a participant performs a task. Illustration: Hearing - Seeing Words
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3.Functional Magnetic Resonance Imaging ( fMRI ) Illustration: Ventricular Enlargement in Schizophrenia An imaging technique that uses magnetic felds and radio waves to produce computer generated images that distinguish between di f erent types oF brain tissue. Illustration: Brain Regions Associated with Lying
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Lecture - 5 - April 8th - STUDYING THE BRAIN: INVASIVE...

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