Event-related optical signal

Definition: Event-related optical signals (EROS) arise from the changes in optical scattering that occur when the neurons become hyperpolarized or depolarised during brain activity. They can be measured from the scalp using NIRS and they are more closely related to neuronal activity than the hemodynamic responses. In fact, the localized brain response is within milliseconds in terms of temporal resolution and in the sub-centimetre range for spatial resolution. The NIRS device must have a sampling rate of at least 100 Hz sampling rate and/or be capable of quantifying scattering changes. Typically these measurements have been difficult to reproduce and are not widely used.

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References:

https://doi.org/10.3758/BF03208834

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

Related terms: infrared light scattering, Fast Optical Signal