2_Unit1.2_Measurement copy

Has poor temporal resolution this does not change as

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Unformatted text preview: your brain is processing actions. •  Characteristics: Good spatial resolution; poor temporal resolution Magnetoencephalography (MEG) •  Records the magnetic fields produced by the electrical activity of the brain. measures the magnetic field that is produced as you think. you cant go very deep into the skull to read the processes you can reallyo nly get reading from the surface(the cortex) of the brain. •  Characteristics: Better spatial resolution; good temporal resolution Magnetoencephalography (MEG) like EEG takes 2 hrs to set up--this takes no time so its cool. Pros: Magnetic fields are less distorted Excellent temporal resolution Reference-Free Less set-up time Direct measure of brain activation magnetic field thats perpindicular to the neuron sctivity Cons: Orientation of MEG Less readily available 20 Functional Magnetic Resonance Imaging (fMRI) •  Aligns atomic particles in tissues by magnetism, then ‘bombards’ them with radiowaves. Different tissues return different radio signals. fMRI determines areas in brain where there is most oxygenated hemoglobin. identifies where blood is becoming more oxygenated--already have notes on this but they are inthe wrong place. limited because you cant walk or stand to measure motor tasks •  Characteristics: Good spatial resolution; poor temporal resolution Functional Magnetic Resonance Imaging (fMRI) Pros: Excellent spatial resolution Cons: Indirect measure of brain activity Susceptible to movement artifacts Use of templates and atlases know this shit!!!!!! Low Resolution High Resolution Spatial Resolution Brain Imaging Temporal Resolution Low Resolution 21 not tested on this Human Connectome not just rea but the connections between the areas are important Summary of Performance Measures Outcome Accuracy Error scores - Absoluter error (1-D) - Radial error (2-D) - Constant error - Variable error Movement Speed Reaction time - simple - choice - discrimination Movement time Response time Magnitude know this shit!!!!!! Process Description of movement Kinematics - displacement - velocity - acceleration - relative motion - phase plane portraits Forces underlying movement Kinetics - force - torque - moment Electrical activity of muscle EMG Brain activity/images EEG, PET, fMRI & MEG But before you start measuring performance….. deiciding what to measure can be theoretical. Is it an objective measure? A measure is objective if it can be employed consistently by different people. It is also objective if the measurement scale is appropriate. Is it a valid measure? This refers to whether a test measures what it is supposed to measure. Does your measure have construct validity? Magnitude measures almost always do. However, is accuracy, consistency, bias a construct of your skill? Is it a reliable measure? Is the measurement repeatable? Deviations in the way a test is performed can result in markedly different results. As a result, change may be incorrectly attributed to difference in performance. objective measure- different people can use the s...
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This document was uploaded on 03/28/2014 for the course KNES 385 at Maryland.

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