[Homer-users] HbO vs HbR analyses

[Meryem Ayse Yucel]

Hi Mehta,

You could consider using short separation detectors (~1 cm) in addition to
long separations. The signal from the short separation mostly represents
the systemic physiology, and the signal from the long represents both. You
could then regress out short separation from the long to estimate brain
response.

Meryem



> Hi all,
>
> We are using the TechEn system to obtain neural patterns in the motor
> cortex during knee extension. We see a marked increase in HbO during knee
> force production that could be because of:
>
>   1.  Neural activity
>   2.  Systemic hemodynamic changes due to knee extension work
>
> We also see an increase in HbR (See dotted lines in attached figure). How
> can we infer neural activation from the two parameters and distinguish It
> from systemic influences.
>
> [cid:2934173B-C6E3-49DA-B701-A44865EB3038]
>
>
> Ranjana Mehta, Ph.D.
> Assistant Professor | Environmental and Occupational Health
> Director | NeuroErgonomics Lab
> Co-Director | Texas A&M Ergonomics Center
> Faculty | Texas A&M Institute for Neuroscience
> Texas A&M University
>
> 106 SPH, College Station, TX 77843-1266
> rmehta at tamu.edu | 979.845.3390
> http://www.ranjanamehta.com/NeuroErgonomics
>
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