Hello, 

Thank you.

Hmm. Well I can't provide details on the script at this particular moment. Although it was an on-off block design being utilised if that helps. 

On Wed, Aug 2, 2017 at 11:13 PM, Eugene Duff <[log in to unmask]> wrote:
Hi - 

You can certainly have a negative BOLD response to an event, relative to rest.  You need to give more details for us to give more specific insight into the effects.

Best

Eugene 

On 2 August 2017 at 23:02, Aaron Ben Mansel <[log in to unmask]> wrote:
Hey Kristian, 

Thanks for the reply. That's entirely possible. I will need to double check the scripts. What exactly would a negative percent signal change mean?

Thanks, 
Ben

On Wed, Aug 2, 2017 at 8:30 PM, Kristian Loewe <[log in to unmask]> wrote:
Hi Ben,

Could it be that your time series are being standardized or transformed to percent signal change at some point in your analysis?

Cheers,
Kristian

On 02.08.2017 20:13, Ben Mansel wrote:
Hello,

This isn't related to FSL - but I am desperate and thought some of the members here would be able to assist.

I have ran analysis on my functional MRI data using a script provided by somebody else. Problem is, I am not entirely sure what the output is.

The numbers I have for the ROIs should be representing 'Response Magnitude'. However, there are some negative numbers. I was under the impression that a negative magnitude doesn't exist, and I am confused as to how this should be interpreted.

Any help would be seriously appreciated.