PSYC20006 Lecture Notes - Lecture 4: Functional Magnetic Resonance Imaging
10 May 2018
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Lecture 4
- ERPs (Event-related potentials): single trial EEG in studies are not good; need to
average across a large number of trials to see some systematic activity
- All the trials have same stimulation in common → when we average across
everything → get rid of everything that influences the single trial on top of it (that we
can’t explain because have not manipulated it)
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- Peaks are called components of ERPs: very systematic, brain always produces;
specific manipulations in experiments influences how strongly peaks are pronounced
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- Random fluctuation or meaningful increase?
- ERPs in cognitive science: can sometimes find component that indexes precisely the
process we’re interested in → can use them to support models of cognition and
decide which model is true; investigate cognition is that many components are very
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Document Summary
Erps (event-related potentials): single trial eeg in studies are not good; need to average across a large number of trials to see some systematic activity. All the trials have same stimulation in common when we average across everything get rid of everything that influences the single trial on top of it (that we can"t explain because have not manipulated it) Peaks are called components of erps: very systematic, brain always produces; specific manipulations in experiments influences how strongly peaks are pronounced. In order to get people to attend to one hemifield first, they manipulated the probability of that a specific colour was the target. One colour had a 75% probability (c75), and another had 25% probability (c25) This prompted participants to very quickly attend to the more likely colour first, and the researchers could monitor attention while participants were scanning the visual field. First, they tested what happened on trials in which there was no target.
