Ledalab, on the other hand, removes the tonic signal in an iterative procedure aimed at model-based decomposition of tonic and phasic components: initial deterministic inversion of the peripheral model (both for CDA and DDA) yields an SN time series from which phasic activity is detected and removed.
Therefore, platelets have been widely used as a practical, easily accessible and reproducible peripheral model for the study of SERT functions and its alterations.
Our results on leukocytes in humans and in animal models support the role of ErbB3 in depression and confirm the usefulness of leukocytes as a peripheral model for studying the biochemistry and molecular biology of the central nervous system.
Ledalab uses two approaches to invert the peripheral model, termed by the authors "Discrete Deconvolution Analysis" (DDA) (Benedek & Kaernbach, 2010b) and "Continuous Deconvolution Analysis" (CDA) (Benedek & Kaernbach, 2010a).
SCRalyze uses a similar peripheral model as Ledalab (Bach, Flandin, Friston, & Dolan, 2010).
Fig. 1B shows the different stages in peripheral model for one of the five pathways.
The platelet is considered to be a peripheral model of neuronal activity with respect to 5-HT function.
Moreover, leukocytes have been proposed as a useful peripheral model to study inflammatory processes in the central nervous system (Sullivan et al., 2006).
The peripheral model SN → SCR is a biophysical model that specifies how SN activity generates SCR, usually in the form SCR = SN⊗SCRF, where ⊗ is the convolution operator, and SCRF is a "canonical" skin conductance response function.
This in turn could result in an alteration in services offered by the practices to a more peripheral model, especially if patients, as demonstrated elsewhere [ 2], chose to use local generalist services in preference to more distant specialists.
