[caret-users] Q) what's the difference among column, average area, and user for threshold adjustment?

[Donna Dierker]

YSL,

Try mapping both ways:  AFM and MFM.  The AFM will give you a T-value, 
based on the enclosing/interpolated voxel.  The MFM will give you a mean 
T-value, based on where your volume intersected each of the 12 PALS hems.

By column here, I think you mean node.  The surface is made up of 
nodes.  Nodes are enclosed by voxels -- typically several nodes are 
enclosed within a given fMRI voxel.

Donna

On 04/09/2009 10:22 AM, Yune S. Lee wrote:
> Many thanks for the help, Donna, but here are my two more dumb questions.
> I'm trying to project a group-T map generated by SPM onto the 
> Human.PALS_B12.BOTH.TEMPLATE-for-fMRI-MAPPING.73730 file.
> Is it the case of multi-fiducial mapping? Also, once the SPM T image 
> is project on to the Human.PALS... template, does each column contain 
> T-value
> in each voxel? Not sure how column is different from the basic unit, 
> voxel, in caret.
> Sorry to bug you by casting dumb questions, but again your help would 
> be appreciated.
>
> Thanks,
> YSL
>
>
>
>
> Donna Dierker wrote:
>> Hi YSL,
>>
>> Reading through 1.22 Metric files in the September 2006 tutorial will 
>> give you an idea of how average area is useful when multi-fiducial mapping.
>>
>> There is a tag-column-threshold pos/neg value for each column in the 
>> metric/surface_shape file format.  If you select column threshold, the 
>> threshold will be set to whatever is stored in those fields (0.0 by 
>> default).
>>
>> Donna
>>
>> On 04/09/2009 09:31 AM, Yune S. Lee wrote:
>>   
>>>  Dear caret users,
>>>
>>>  I'm wondering what are the differences among column, average area, and 
>>> user for the threshold adjustment of metric settings.
>>>  I'm hoping to see the area whose t-value is 5.4 in my data, so I guess 
>>> I set it to user and type 5.4 in the pos.
>>>  But, it would be great to know what column and average area are about.
>>>  Any help would be appreciated.
>>>
>>>  Thanks,
>>>  YSL
>>>
>>>
>>>
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