The original DCM for M/EEG publications looked at the modulation of connectivity between sources only. However, one could also formulate hypotheses that posit a modulation of within-source (intrinsic) connectivity. This feature has been implemented in SPM8 and is useful for testing hypotheses about adaptation of neuronal responses to local influences, in relation to influences that are mediated by long-range extrinsic connections (forward, backward, and lateral) from other sources.
 
S.J. Kiebel, M.I. Garrido, and K.J. Friston. Dynamic causal modelling of evoked responses: The role of intrinsic connections. NeuroImage, 36:332-345, 2007.
 
These descriptions of the new features are taken from the SPM8 Release Notes
 
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