 |
 |
The duration of an event should be the length you expect the neurons to be active. However, as Jonathan pointed out in the case of everything less than 1 (and up to possibly 2 seconds) the duration will have a small impact. The difference between block/event-related designs is simply the duration of the stimuli (or more accurately the duration of the neual active). One other difference is that the rest periods are more similar in length in block designs and are thus longer. Roughly the cut off is 10-15 seconds. There are exceptions such as slow event-related designs. I've done event-related designs with stimuli lasting 7 seconds before (search Burton, McLaren, blind on pubmed). Best Regards, Donald McLaren ================= D.G. McLaren University of Wisconsin - Madison Neuroscience Training Program Office: (608) 520-0586 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (608) 520-0586 or email. On Fri, Mar 5, 2010 at 11:32 AM, Jose Miguel <[log in to unmask]> wrote: > Hi all, > > I am doing event related analysis and I have a simple question. In the 1st > level analyses, i > set the times of the events and I set the duration to be 0.9s. I don't know > if it is correct or > if I need to det it to 0s as it is an event related. > > Thanks for the help. >