brain scans and longitudinal studies

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  • Created by: Elyseee
  • Created on: 24-06-20 11:12
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  • brain scans and longitudinal studies
    • brain scans
      • EEG
        • electroencephalogram
        • dement and kleitman stages off sleep 1957
        • elextrodes placed on scalp, electrical activity in brain recorded
      • CAT scans
        • computed axial tomography. series of xrays combined to create 2d/3d images. dye injected into patient
        • exposes patient to radiation. only structural information
        • reveals abnormal structure, more detailed than xrays
      • MRI scans
        • magnetic resonance imaging. Magnetic field that causes atoms in  brain to change alignment when magnet is on, emits radio signals when magnet is off. Detector picks up signals, constructs image of the brain. fMRI provides structural and functional information, takes repeated images of brain in action
        • take a long time, can be uncomfortable
        • more detailed image of soft tissue than cat scans, good for patients who undergo examination successively
      • PET scans
        • positron emission tomography. Administer slightly radioactive glucose to patient. Radiation detectors pick up radioactive areas. 10-40 mins
        • reveal chemical information, distinguish between benign and malignant tumours, show brain action
        • costly, less precise, can only be used a few times because of radioactivity
    • longitudinal studies
      • research conducted over a period of time to observe the effects of something time affected
      • case studies can be  lomgitudinal
      • developmental psychologists use this to study changes with age
      • control of participant variable
      • repeated measure
      • take a long time, difficult to finance
      • participants may drop out, leads to biased sample
      • participants may become aware of aims
    • cross-sectional studies
      • alternative to studying effects of age
      • studies 2 contrasting groups at the same pint int time
      • looks at factors other than effect of age eg. professional behaviour
      • quick to carry out
      • participant variables
      • cohort effects

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