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psychology: paper 2:

psychology: paper 2: biopsychology: ways of studying the brain:

QuestionAnswer
1. how does fMRI's work? detect changes in blood oxygenation and flow in brain a when brain more active it consumes more oxygen so more blood flow making three dimensional images
2. how do electroencephalograms work? measures electrical activity in brain using electrodes fixed to scalp using skull cap then brainwave patterns produced
3. what does EEG stand for? electroencephalogram
4. what types of waves does the EEG make? eta, alpha, theta and delta
5. what are beta waves? highly alert
6. what are alpha waves? relaxed awake
7. what are theta waves? drowsy/ sleeping
8. what are delta waves? deep sleep
9. what does ERP stand for? event relation potentials
10. how do event related potentials work? measure brains response to specific stimuli or events electrodes via electrical charges to the face so shown stimulus and record activity
11. what are post mortem examinations? examination of body after death to determine cause of death usually examine brain for abnormalities that may explain behaviour
12. what are other types of scans? PET and CAT/CT
13. what is temporal resolution? accuracy of scanner in relation of time - how quickly technique can detect changes in brain activity
14. what is spatial resolution? smallest feature or measurement the scanner can detect
15. why do electroencephalograms have good temporal resolutions? take readings every millisecond
16. why do electroencephalograms have poor spatial resolutions? can only tell roughly where in the brain the electrical signals are coming from
17. describe the resolution of FMRI's good spatial resolution poor temporal resolution
18. what are the strengths of FMI's? non invasive and offers a more objective and reliable measure of psychological processes than what is possible with verbal reports
19. what are limitations of FMIR's? not a direct measure of neural activity in particular areas due to change in blood flow and expensive with poor temporal resolution
20. what are strengths of electroencephalograms? good temporal resolution, non invasive and cheaper than scanning used for clinical diagnosis eg neural activity measured associated with epilepsy
21. what are limitations of electroencephalograms? poor spatial resolution and EEG signal is not useful for pinpointing exact source of activity as it can be picked up by neighbouring electrodes
22. what are strengths of event related potentials? continuous measure means it's possible to determine how processing is affected cheaper than scanning can measure processing of stimuli even in the absence of a behavioural response
23. what are limitations of event related potentials? large number of trials needed to gain meaningful data and only sufficiently strong voltage changes generated across the scalp can be recorded
24. what are strengths of post mortem? more detailed examination of anatomical and neurochemical aspects of the brain as examine deeper regions Harrison used it to develop the central part in our understanding of schizophrenia
25. what are limitations of post mortem? various factors can influence the post mortem of the brain as people die in a variety of circumstances eg drug treatment and it is retrospective data where the researcher is unable to follow up as dead
Created by: chachink
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