Hi,
I think one possibility is that averaging multiple trials diminishes the
contributions of any one trial in which motion was particularly large, just
like spatial averaging would do.
-jim
>Dear James,
>
>>
>> I my experience event-related designs are only "less susceptible" to
>> artefactual activation if you average multiple trials into a single
>> event type. Without averaging multiple trials the degree of artefactual
>> activation appears to scale with the size of movements just like in
>> block design experiments.
>
>
>Do you have any ideas about why this should be the case (i.e., why averaging
>should reduce the effect of motion?).
>
>Thanks for any reply,
>Eric
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Jim Eliassen, Ph.D.
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