> Dear all,
> We are planning acquisitions of fMRI experiment in order to evaluate
> cognitive functions on Steinert patients. A usual clinical test is the
> Conner?s CPT, a task lasting 14 min and consisting in the presentation
> of target and non target stimuli at rate variable from 1Hz to 0.25Hz.
> Inserting two rest period at the beginning and at the end of the test
> will allows us to analyze activated cerebral areas during the overall
> test using a blocked design?
> If not, what changes would you suggest us?
I'm not familiar with this test but given it already works in blocks why
not using a controlled block design? alternating for blocks ISI 4s, 2s,
1s, (these 3 ones are randomly presented right?) and rest; then do it
again, so that you get a better estimate of the rest.
I personally do not like beginning and end of a session for the rest as
1- I think subjects aren't in the same rest state and 2- rest in between
relaxes your hr for a little while which is always good ..
Hope this helps