L7-Neural Activity

L7-Neural Activity - Sensory Processes Perception PSY 343 Fall Session 2007 Lecture 7 Measuring Neural Activity Instructor Sean Green Studying

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    PSY 343 Fall Session 2007 - Lecture 7 Measuring Neural Activity Instructor:  Sean Green
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    Studying Perception – Neural Activity  Review - Neural Activity Neurons carry information through action  potentials When an action potential travels across  a neuron, charged particles move into  and out of the cell through ion channels We can get some idea of which neurons  are active in spreading information by  measuring the physiological effects of  action potentials
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    Studying Perception – Neural Activity  Techniques for measuring brain activity Measuring electrical/magnetic activity Single-cell recording EEG  (Electroencephalography) MEG (Magnetoencephalography) Voltage sensitive dye Measuring metabolic activity 2-DG (2-Deoxyglucose) PET (Positron emission tomography) fMRI Blood oxygenation level dependent (BOLD)
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    Studying Perception – Neural Activity  Single-cell recording Done by positioning a microelectrode in a neuron When an action potential reaches that neuron, the  microelectrode detects the change in electric charge The electrode’s response can be seen on an  oscilloscope One limitation is that it’s sometimes hard to get the  electrode to the neurons without causing damage
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    Studying Perception – Neural Activity  EEG (Electroencephalography) How EEG works Neurons in the brain produce electrical activity Electrodes on the head record changes in electrical  activity through the scalp Usually electrodes are placed in many locations on the  scalp Good temporal resolution (you can tell when activity  happens) Bad spatial resolution (hard to tell where it happened) Here’s a Brookhaven lab site with pictures and info   http://www.bnl.gov/neuropsychology/ERPs_al.asp
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    Studying Perception – Neural Activity  Event related potentials Electrodes will detect electrical noise and brain  activity that has nothing to do with what you are  studying To get rid of irrelevant activity, researchers often  measure ERPs First, present the stimulus many times (many trials) Line up the EEGs for each trial Irrelevant activity will (hopefully) cancel out Activity related to the stimulus event (Event related 
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This note was uploaded on 06/05/2008 for the course PSY 343 taught by Professor Green during the Fall '07 term at SUNY Buffalo.

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L7-Neural Activity - Sensory Processes Perception PSY 343 Fall Session 2007 Lecture 7 Measuring Neural Activity Instructor Sean Green Studying

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