Hi Eugene,
Thanks for your comments.
Just to clarify
2 different runs for each subject
2 different hand movements - A & B (Tasks)
>> Run 1 rArArBrArBrBrArB
>> Run 2 rBrArArBrArArBrB
If I understand this correctly for run 1 for example, analyse each task independently, ..... following this performed a higher level analysis to obtain the mean effect.
The number of EV's for each first order analysis therefore would be dependant on the variations within the run.
Not sure how we accommodate for differences in the cycling.
??if for example the number of TR's (3sec) in each r, A and B is 4
first order analysis
EV1 A task Skip 0 Off 12 On 12 Phase 0 Stop after 48
then
EV2 A task Skip 48 Off 12 On 12 Phase 0 Stop after 72
then
EV3 A task Skip 72 Off 12 On 12 Phase 0 Stop after 96
then
EV4 A task Skip 96 Off 12 On 12 Phase 0 Stop after 144
then
EV5 A task Skip 144 Off 12 On 12 Phase 0 Stop after 168
then
EV6 A task Skip 168 Off 12 On 12 Phase 0 Stop after 192
4 contrasts (for each EV)
1 A 1 0 1 0 1 0
2 B 0 1 0 1 0 1
3 A-B 1 -1 1 -1 1 -1
4 B-A -1 1 -1 1 -1 1
I'm probably completely on the wrong track here.
Thanks,
Mike
On 24/10/2010, at 7:06 PM, Eugene Duff wrote:
> Hi Mike
>
>
> On 24 October 2010 05:51, Mike Bynevelt <[log in to unmask]> wrote:
>> Need help ...suppose that's why I'm here.
>> Involved with a study requiring ANOVA analysis
>>
>> 13 controls, 13 subjects
>> 2 paradigms with 3 conditions
>> 1 rest 2 differing hand movements
>>
>> Paradigm 1 r1r1r2r1r2r2r1r2
>> Paradigm 2 r2r1r1r2r1r1r2r2
>>
>> Needing to compare r and 1, r and 2, 1 and 2 initially
>
> This shouldn't be too difficult to set up. By two paradigms, do you
> simply mean two different orders? Do you have both for all subjects?
>
> If so, and you're just wanting to do the comparisons you specify,
> model 1 and 2 with separate regressors at the first level, merge them
> as shown in the Multi-Session & Multi-Subject (Repeated Measures -
> Three Level Analysis) example on the web page, and then model an
> average effect and between group differences at the third level.
>
> Cheers,
>
> Eugene
>
>
>>
>> Given the kind of randomness of the paradigm, unsure how to set up in modelling.
>>
>> Thanks in advance for any help.
>>
>> Cheers,
>> Mike
>>
>>
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