Dear SPMers,
I am completely new to fMRI research and I doubt if this is an
appropriate question here...but I will try... I am soon going to start
the design of an fMRI task on power point presentation. I have the
structure organized, but what I am unsure of is the MatLab syntax to
trigger the presentation. We have 6 conditions Fear, neutral objects,
neutral bodies, disgust core, disgust animal and sexual
Exposure of each Stimulus 1.4s
Inter-Stimulus interval 1s
1 Block = 10 stimuli (1.4x10)+(9x1)= 23s
Inter-Block interval 16s (8s rating + 8s cross fixation)
1 Run = 6 blocks (23 x 6) + (16 x 5) = 218s
(1 condition per block, pseudorandom e.g. D, N1, N2, F, SN, and P.
There will be 6 repetitions i.e. 60 stimuli of each condition)
Inter-Run interval (fixation of cross and instructions) 30s
Experiment = 6 runs (218x6)+(30x5)= 1458s
I apologize for taking your time but would appreciate your
guidance/referral immensely.
Thanks in advance
Charmaine
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