EEG and Symmetry Flashcards
What does EEG measure?
measures voltage between active electrode and a reference electrode
What is the temporal resolution like in an EEG?
good
What is the spatial resolution like in an EEG?
poor
What is an event related potential?
the signal you get from an EEG
a marker of a discrete cognitive event in the brain
What does error related negativity mean?
happens on trials which have made an error
What id the extrastriate network?
a network of symmetry sensitive brain areas in extrastriate cortex
What does the extrastriate network do in symmetry?
the extrastriate network responds to symmetry automatically, even when people aren’t attending to it
What does the network generate?
the Sustained Posterior Negativity (SPN)
What does the network respond to?
symmetry and anti-symmetry
What is the symmetry network indifferent to?
colour
could paint a symmetrical image in different colours but response is always the same
What does fMRI tell us?
which brain areas respond to symmetry and generate SPN
How can symmetry response increase?
through repeated presentation
(SPN priming)
What is meant by habituation?
decrease in a person’s response to stimuli after repeated exposure
What is meant by priming?
exposure to one stimulus influences how someone perceives a subsequent stimulus
How can you learn a lot from symmetry perception?
by pooling data from all experiments into a big catalogue
