Dear Haoran,
The following paper can help you understand the meaning of forward, backward, and lateral connections along with some other definitions which are used in DCM:
David, O., L. Harrison, et al. (2005). "Modelling event-related responses in the brain." NeuroImage 25(3): 756-770.
Best,
Pegah
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Pegah Tayaranian Hosseini
PhD Student
Room 4077, Tizard building (13)
Institute of Sound and Vibration Research
University of Southampton, SO17 1BJ, UK
Tel: 023 8059 2850
email: [log in to unmask]
________________________________________
From: SPM (Statistical Parametric Mapping) [[log in to unmask]] On Behalf Of 敬抵 [[log in to unmask]]
Sent: 10 March 2011 03:07
To: [log in to unmask]
Subject: [SPM] [SPM DCM MEG]how to specify the different kinds of connections among the sources?
Dear SPM's users,
When we construct a specific DCM model, we should specify different kinds of connections to those sources, but:
1. I wonder that whether the lateral connections only exist between the sources which are in the same level ? And, what does ' the same level ' mean ? Does it mean the two regions own the same function, such as the left visual region and the right visual region ?
2. Does forward connections only exist between the sources which are in the different level ? Such as low-level and the high-level ?
3. Do backward connections are always generate from high-level regions and terminate in those low-level regions ?
All in a word, how could we specify the different connections among those sources ? Any help will be appreciated.
--
Haoran LI (MS)
Brain Imaging Lab,
Research Center for Learning Science,
Southeast University
2 Si Pai Lou , Nanjing, 210096, P.R.China
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