Fast Optical Signal

Definition: Fast optical signal (FOS) (also known as Event-related optical signal (EROS) for the time-locked to particular events) is the signal measured on a time scale ~100ms and it is thought to be related to scattering changes due to neuronal activity: when neurons pass from an inactive state to a hyperpolarized or depolarised state, they cause a change in the scattering of the tissue. FOS are more closely related to neuronal activity than the hemodynamic response.

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References:

https://doi.org/10.3389/fnhum.2010.00052

https://doi.org/10.1016/j.neuroimage.2005.03.006

https://doi.org/10.1162/jocn.1995.7.4.446

https://doi.org/10.1016/j.neuroimage.2010.02.076

Related terms: EROS (Event-related Optical Signal)