NEUROPSYCHOLOGY - methods-studying human patients with...

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NEUROPSYCHOLOGY- Research methods: -studying human patients with lesions; problem is that lesions are rarely isolated to one region -Ablation (extirpation)-any surgically induced brain lesions created in animals; can also create leasions by inserting tiny electrodes into brain -stereotaxic instrument: device used to locate brain areas when electrodes are implanted to make lesions or stimulate nerve cell activity -Electrical stimulation -Wilder Penfield: first used this method; stimulate a part of the brain with an electrode, electrical charge causes neurons to fire and the behavioral process controlled by those neurons can be mapped out -neurosurgeons rely on patients who are awake during these tests to map out regions; no pain receptors in the brain -brief bursts of electrical current can elicit sleep, sexual arousal, rage, or terror -Single Cell Recordings -microelectrodes inserted into one single cell to measure level of activity -David Hubel and Torsten Wiesel: used this method to measure visual cortex cell’s activity in cat; monitors ongoing activity Electroencephalograph: -puts electrodes on surface of head; measures large number of neurons’ activity -machine detects broad levels of activity and produces EEG; sleep research relies heavily on this method Regional Cerebral Blood Flow (rCBF): -detects broad patterns of neural activity based on increased blood flow to different parts of the brain -CAT scans, PET scans, and MRIs are all scanning devices that record blood flow
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This note was uploaded on 04/20/2008 for the course PSYCH GRE Prep taught by Professor General during the Spring '08 term at Duke.

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NEUROPSYCHOLOGY - methods-studying human patients with...

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