Methods and Tools for Studying the Brain

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Presentation transcript:

Methods and Tools for Studying the Brain

Techniques to study the brain A brain lesion experimentally destroys brain tissue to study animal behaviors after such destruction (disease) OBJECTIVE 11| Describe several techniques for studying the brain.

Microelectrode Techniques Very small electrodes inserted into individual neurons Used to study activity of a single neuron

Macroelectrode Techniques Used to get a picture of overall activity in the brain EEG (Electroencephalogram) uses electrodes placed on a person’s scalp to measure an amplified recording of the electrical waves sweeping across the brain’s surface.

Structural Imaging Computerized Axial Tomography (CAT-scan) Uses X-rays to create a 3-dimensional image of the brain CT scans can often show the size and locations of brain abnormalities caused by tumors, blood vessel defects, blood clots, strokes and other problems.

Structural Imaging cont’d Magnetic Resonance Imaging (MRI) Uses a magnetic field and radio waves to produce computer-generated images They distinguish among different types of brain tissue. Image shows ventricular enlargement in a schizophrenic patient. Cerebral Ventricles - fluid-filled spaces in the brain

CT Scan vs. MRI CT may be less expensive than MRI. In addition, it is less sensitive to patient movement. CT can be performed if you have an implanted medical device of any kind, unlike MRI. MRI contrast materials used for image enhancement have very low incidence of side effects

Functional Imaging Shows the brain functioning in real time (movies or series of images) Positron Emission Tomography (PET) and Single Photon Emission Computed Tomography (SPECT) Use radioactive glucose to determine location of greatest brain activity PET Scan of Normal Brain PET Scan of Alzheimer's Disease Brain

Functional Imaging Functional Magnetic Resonance Imaging (fMRI) Shows function and structure by measuring movement of blood molecules within the brain WIRED SCIENCE | Lie Detectors | PBS https://www.youtube.com/watch?v=KNumpFy58Bk