Ways to study the Brain!!! Accidents: damage to brain regions can tell us about their functions Phineas Gage.

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Ways to study the Brain!!! Accidents: damage to brain regions can tell us about their functions Phineas Gage.

Lesions: tissue destruction Cutting into the brain and looking for change. Brain tumors also lesion brain tissue.

Less Invasive ways to study the Brain Electroencephalogram (EEG) Computerized Axial Tomography (CAT) Positron Emission Tomography (PET) Magnetic Resonance Imaging (MRI) Functional MRI

Electroencephalogram (EEG) Electrodes placed on the scalp create an amplified recording of the waves of electrical activity that sweep across the brain’s surface

CT scan CT (computed tomography) Scan a series of x-ray photographs taken from different angles and combined by computer into a composite representation of a slice through the body; also called CAT scan

PET Scan PET (positron emission tomography) Scan a visual display of brain activity that detects where a radioactive form of glucose goes while the brain performs a given task

MRI Scan MRI (magnetic resonance imaging) a technique that uses magnetic fields and radio waves to produce computer-generated images that distinguish among different types of soft tissue; allows us to see structures within the brain MRI scan of a healthy individual (left) and a person with schizophrenia (right) Note the enlarged fluid - filled brain region in the image on the right.

fMRI Scan Functional MRI Reveals blood flow, and therefore, brain activity by comparing successive MRI scans. “Reading Your Mind” – 60 Minutes

Brain Restoration – Plasticity The ability for our brains to form new connections after the neurons are damaged. Evidenced by brain reorganization following damage (especially in children) and in experiments on the effects of experience on brain development The younger you are, the more plastic your brain is. Plasticity of sensory cortex

Brain Restoration Glial Cells cells in the nervous system that support, nourish, and protect neurons