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Psychology Lecture Sept 21.docx

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University of Ottawa

PsychologySeptember 21 2011IIIThe Brain CNSAIntroductionThe ancient Greek was not very impressed with the brainThey assumed the brain was just there too cool the blood AristotleHypocrates did not accept that the heart created behavior His conclusion about the brain was From the brain and the brain only arise our pleasures joys laughter and jests as wells as our sorrows pains griefsBTool of Discovery how do they study the brainB1Clinical ObservationOldest methodThe brain is inside the skull they couldnt access itDid indepth investigations case study to see how a tumor in this part of their brain how is it affecting their life Continues to be important todayB2 Brain ManipulationResearcher interferes with the functioning of the brain on purpose and observes to see how this interference affected the person emotions behavior etcSurgical researcher will cut off a connecting between to brain parts removedestroy a brain area what does it affectChemical inject a drug that is going to affect a specific brain area watch to see what happens Would they still remember things etcElectrical one or two ways One implant electrons generate a small electrical stimulation see what it does Two open up skull complete and stimulate that brain with electrical stimulation Magnetic expose area of brain interested in studying to magnetic field it will affect it and you observe what happensOptogenetics genetically engineer neurons to respond to light shine a laser light on the area they are interested inB3 EEGShows you what the brain is doing at a certain timeb4 Neuroimaging Techniques1CT or CAT ScansinvasiveUse radiation to take pictures of the brainTake multiply images from different anglesComputer puts the images togetherDoesnt show you the brain in action it shows you the structure is there a tumor loss of tissues2MRINon invasiveToday its considered safeBombarded with a powerful magnetic fieldMakes electromagnetic signals that the computer uses to create images of the brain
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