lec02-4 - Brief Introduction to Neural Imaging with...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Brief Introduction to Neural Imaging with Application to Processing Human Faces Psychology 355: Cognitive Psychology Winter Quarter 2009 1/15/2009
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
P 355, Miyamoto, Winter '09 2 Outline • Methods of Neural Imaging: • Debate Over Whether the So-Called Face Area Is Really Specialized Only to Faces Next: Methods of Neural Imaging
Background image of page 2
P 355, Miyamoto, Winter '09 3 Correlational Methods of Cognitive Neuroscience • Single cell recordings. Multiple single cell recordings. • Event-Related Potentials (ERP’s) o Measures electrical potentials on the scalp while processing a stimulus. o Poor spatial resolution. Excellent temporal resolution. o Relatively non-invasive. • Positron Emission Tomography (PET) • Functional Magnetic Resonance Imaging (fMRI) o Measures the BOLD response in different parts of the brain. BOLD = Blood Oxygen Level-Dependent response ( more explanation on next slide ) o Good spatial resolution. Poor temporal resolution (better than PET). o Relatively non-invasive Next: Picture of an MRI Magnet
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
P 355, Miyamoto, Winter '09 4 fMRI Uses a Big Magnet This images is used with permission of the author, J. J. B. Allen at the University of Arizona. Next: Graphic Showing BOLD Contrast
Background image of page 4
P 355, Miyamoto, Winter '09 5 Measuring Activation – A Subtraction Measure Brain Activity = Oxygen Concentration in Test Condition minus Oxygen Concentration in Control Condition Control Condition Test Condition Next: Details of fMRI Measurement
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
P 355, Miyamoto, Winter '09 6 Downloaded with permission from the website of John J.B. Allen (http://www.u.arizona.edu/~jalle n/Syllabus%20401_501_Spring06.htm) • BOLD response – B lood O xygenated L evel-D ependent response (the response is dependent on the level of oxygenated blood) • A.k.a. hemodynamic response (response observed in the blood over time) Next: Example of an fMRI Brain Image
Background image of page 6
7 Activations Activations are regions of significant change from a control condition to a test condition. Brain image shows regions of significant activation when comparing Test Condition to Control Condition. (Slice of brain is viewed from above.) The purpose of this slide is just to show a common way to display brain activation as measured by fMRI. Specific details are not important. Example:
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 25

lec02-4 - Brief Introduction to Neural Imaging with...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online