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
Excellent temporal resolution
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
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
Susceptible to movement
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
- Absoluter error (1-D)
- Radial error (2-D)
- Constant error
- Variable error Movement Speed
- discrimination Movement time
Magnitude know this shit!!!!!! Process
Description of movement
- relative motion
- phase plane portraits Forces underlying movement
- moment Electrical activity of muscle
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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- Fall '08
- Reaction, Motor control, std dev, variable error