¥ Second: Event-related FMRI
H ÒActivationÓ occurs in single relatively
brief intervals
H ÒEventsÓ can be randomly or regularly
spaced in time
o If events
are randomly spaced in time, signal model itself looks
noise-like (to the human eye)
H BOLD response to stimulus tends to be
weaker since fewer nearby-in-time
ÒactivationsÓ have overlapping hemodynamic
responses
¥ Next slide: Visual stimulation experiment