PSYC 4600 Lecture Notes - Lecture 3: Evoked Potential, Electroencephalography, Multiple Comparisons Problem
11 Dec 2016
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Inflates the likeliness of finding false positives with multiple fmri studies on voxels. There is a lot of noise in fmri studies, you will find difference simply in random variations in noise. When we correct for multiple comparisons (by remaining regionally specific), we look at past research, past research, etc. Easier to (cid:272)o(cid:373)pare a(cid:272)ross peoples (cid:449)ho"s (cid:271)rai(cid:374)s all ha(cid:448)e slightl(cid:455) differe(cid:374)t shapes. Measuring the electrical activity in the brain time sensitive, how this activity changes over time (can occur in systematic ways) Historical origins: hans berger first eeg in 1924, mathematics student. Measuring blood flow changes in the scalp when more blood flow there is more activity. Measuring activity of electrical impulses by placing electrodes on their scalp (used ppl missing their scalp in pieces so it gave him a stronger signal) Alpha waves reliant waveform in an eeg, systematic high spiking rate, related to general arousal (strong when you close your eyes, general drifting, not paying attention)
