[Homer-users] PCA Filter in HOMER2

[Chen]

Thanks Katie.

Sent from my iPhone

> On 2015Äê12ÔÂ16ÈÕ, at 18:58, Kathleen Shaw <kathleen.shaw at uconn.edu> wrote:
> 
> Dear Jessie,
> 
> Attached is 
> 
> Huppert, T. J., Diamond, S. G., Franceschini, M. A., & Boas, D. A. (2009). HomER: a review of time-series analysis methods for near-infrared spectroscopy of the brain. Applied Optics, 48(10), D280¨CD298.
> 
> That has a brief section on how the PCA Filtering process works. Hope that helps!
> 
> Thanks,
> Katie
> 
>> On Wed, Dec 16, 2015 at 12:07 PM, Chen Zhao <chenzhao510 at gmail.com> wrote:
>> Hi all,
>> 
>>  
>> 
>> I¡¯m currently using Homer2 to analyse the adult NIRS data. I¡¯ve got a question regarding to ¡®PCA_Filter¡¯ in pre-processing.
>> 
>>  
>> 
>> I¡¯ve checked Homer-users mailing history, understand that PCA is used for reducing artefacts especially motion artefacts from the data. However it hasn¡¯t mentioned how does PCA_Filter works, does it just reduce the dimension and remove the highest eigen value principle component(s) to the data (depends on the set value), or does it also do the whitening on the data?
>> 
>>  
>> 
>> Your answer is very much appreciated.
>> 
>>  
>> 
>> Best regards,
>> 
>>  
>> 
>> Jessie
>> 
>>  
>> 
>> 
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> 
> <HuppertEtAl_2009.pdf>
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