Dear Sir:
With the data published on Dr. W.Penny's
website(http://www.fil.ion.ucl.ac.uk/~wpenny/datasets/attention.html),
i built a DCM model with full intrisic couplings
between V1,V5,PPC,PFC (V1->V5,PPC,PFC
,V5->V1,PPC,PFC.......), and there are no modulatory
input included. Extrinsic input is restricted to A1.
Then i got the Result:
DCM.A:
V1 V5 PPC PFC
V1 -1.0000 -0.0074 -0.0810 0.0132
V5 0.1593 -1.0000 -0.0383 -0.0017
PPC 0.4692 0.0728 -1.0000 0.0190
PFC 0.0539 -0.0095 -0.0453 -1.0000
DCM.pA:
V1 V5 PPC PFC
V1 NaN 0.3459 0.4874 0.3577
V5 0.9026 NaN 0.3370 0.3363
PPC 1.0000 0.4723 NaN 0.3683
PFC 0.2117 0.3467 0.3307 NaN
Question1:With the DCM.pA Could i infer that the
intrisic coupling between these areas are V1->V5 and
V1->PPC ?
the instruction about DCM on Dr. W.Penny's website
told me that:"9. Make the following intrinsic
connections V1 to V5, V5 to V1, V5 to PPC, PPC to V5,
PPC to PFC and PFC to PPC."
Question2:It seems my result is wrong, could you tell
me why and how to infer intrisic coupling?
Question3:How to specify the contrast vector of the
Contrast of connection? and how to read the result of
the contrast?
I'm a begginer ,would you please explain it in
detail ?
Thank you for your help.
Bei Li(Li Bei)
=====
Bei Li
Institute of Neuroinformatics
Dalian University of Technology
2 Ling Gong Rd, Dalian 116023, China
Email:[log in to unmask]
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