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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.
>>>
>>>
>