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Lecture+06_Methods_Assess_S (1)

Lecture+06_Methods_Assess_S (1) - Quick Review 1 2 3 What...

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Quick Review 1. What are the characteristics of the2 main categories of cerebrovascular accident? 2. What are the different types of histology used to visualize the brain? 3. When considering the different ways to visualize the brain, list their relative advantages and disadvantages.
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Neuropsych Methods & Assessment: Outline I. Neuropsych Methods I. Brain injury II. Visualizing the brain 1. Correlating brain anatomy with behavior 2. Recording brain activity during behavior 3. Examining the effects of stimulating particular parts of the brain II. Neuropsych Assessment
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Methods of Visualizing the Brain Histology Radiological Procedures using X-rays General X-ray images Computerized Axial Tomography (CT or CAT) Dynamic imaging Positron Emission Tomography (PET) Magnetic Resonance Imaging: MRI & Functional MRI (fMRI) Electrophysiological Procedures
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Electrophysiologic Procedures Electroencephalography Evoked potential Magnetoencephalography Electrical stimulation Intracranial brain stimulation Transcranial Magnetic Stimulation
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Electroencephalographic (EEG) recording Recording of voltage fluctuations, “brain waves”, by voltmeter placed on skull Valuable tool for Studying sleep Monitoring the depth of anesthesia Diagnosing epilepsy & brain damage Studying normal brain function Amplitudes reflect how “near” active cells are, & degree of activity Use amplitude (height of brain waves) & frequency (# waves/second) to identify patterns
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EEG: Different Patterns Reflect Different States of Consciousness Beta (β) rhythm Alpha (α) waves Delta (δ) waves
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BEAM and MRI B rain E lectrical A ctivity M ap Color-coding of EEG activity of both hemispheres MRI conducted and EEG activity superimposed to relate electrical activity with precise location
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Evoked Potential (EP)/Event-Related Potential (ERP) Brief changes in slow-wave EEG elicited by a specific stimulus Because this starts at the brainstem level & travels to cortex, get a sense of how information flows through the brain (more time=more intricate pathways) Used to study normal signal pathways, function of nuclei carrying signal, & cognitive processes in neocortex Different stimuli will engage functions reflected by different lobes e.g., occipital for visual stimuli; temporal for auditory stimuli
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