Module 4 - Module 4: The Brain I The Tools of Discovery A....

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Module 4: The Brain I The Tools of Discovery A. Lesion tiny clusters of normal or defective brain cells with tiny electrical pulses tissue destruction. A brain lesion is a naturally or experimentally caused destruction of brain tissue 1 Probe brain with tiny electrical pulses 2 Snoop on messages of individual neurons & on mass action of billions of neurons 3 Color representations of brain’s energy-consuming activity 4 B. Clinical Observations 1 Oldest method of studying brain-mind connections is to observe effects of brain diseases & injuries 1 st recorded 5000 years ago 2 Last 2 centuries physicians began systematically recording results of damage specific to brain areas 3 Damage on 1 side caused paralysis to other side 4 Damage to back disrupted vision, left front disrupted speech C. Manipulating the Brain 1 Electrically, chemically, or magnetically stimulate various parts of brain & note effects 2 Surgically lesion tissue in specific areas in animals D. Recording the Brain’s Electrical Activity 1 Tips of modern microelectrodes so small they can detect electrical pulse in single neuron precise findings 2 Electroencephalogram amplified tracing of waves by instrument called electroencephalograph 3 Studying EEG of gross activity of whole brain is like studying activity of car engine by listening to hum of motor once can identify electrical wave evoked by stimulus E. Neuroimaging Techniques 1 Computed tomography (CT) scan examines brain by taking x-ray photos that reveal brain damage 2 Positron Emission Tomography scan (PET) depicts brain activity by showing each brain area’s consumption of its chemical fuel, sugar glucose a Active neurons = glucose hogs person given temp. radioactive form of glucose & PET scan locates & measures radioactivity detecting where “food for thought” goes b Noting hot spots researchers see which brain areas are most active as person performs mathematical calculations, listens to music, or daydreams 3. Magnetic Resonance Imaging (MRI) head is put in a strong magnetic field, which aligns the spinning atoms a. brief pulse of radio waves disorients atoms momentarily
Background image of page 1

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

View Full DocumentRight Arrow Icon
b. return to normal spin & release detectable signals which become computer-generated images of concentrations c. MRI’s reveal enlarged fluid-filled brain areas in patients who have schizophrenia 4. where brain is active blood goes functional MRI machine detects blood rushing to back of brain visual information 5. data from different brain-imaging techniques are appearing fast brain cartography will give researchers instant access through electronic networks to PET or MRI studies that reveal activity in brain areas
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/14/2008 for the course PSYCH 101 taught by Professor Barbagallo during the Fall '07 term at Montclair.

Page1 / 5

Module 4 - Module 4: The Brain I The Tools of Discovery A....

This preview shows document pages 1 - 3. Sign up to view the full document.

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