Following up from the recent discussion of conjunction analyses in SPM, I just
wanted to post a short list of previous emails on this topic which may be
helpful. I've broken it down into those relating to 1) SPM96, 2) SPM99b, and
3) SPM99. Note that this is not an exhaustive list.
All URLs are preceded by www.mailbase.ac.uk/lists/spm/
SPM96: This was the first public SPM release to include conjunctions
based on the Price & Friston (1997) paper "Cognitive conjunction: a
new approach to brain activation experiments."
1999-01/0127.html Cathy Price - explains conjunc/masking
1999-02/0040.html Cathy Price - explains conjunc/masking
1999-03/0045.html Karl Friston - validity of the spm96 approach
There were emails prior to 1999 when Cathy and Karl explained the
appropriate use of conjunctions and masking for analysing interactions
which may still be relevant to those of us using SPM99.
SPM99b: I understand that Keith Worsley made some advances which allowed
the SPM group to revise their method for calculating conjunctions. This
was first implemented in the beta-release of SPM99 -- called SPM99b.
1999-07/0037.html Cathy Price - calculating thresholds
1999-08/0047.html Karl Friston - calculating thresholds
1999-09/0073.html Karl Friston - SPM96/spm99 and thresholds
2000-01/0091.html Karl Friston - spm96/spm99
(I seem to recall that Jesper Andersson had a clear message around this
time about the differences in SPM96 and SPM99b both theoretically and
in terms of implementation but I wasn't able to find it again -- sorry!)
And the recently posted articles:
2000-11/0090.html Will Penny - a solution for A-C and B-C conjunctions
2000-11/0116.html Richard Perry - spm96/spm99
2000-11/0121.html Joe Devlin - a solution for A-C and B-C conjunctions
Finally, there has been some discussion at times about implementing conjunction
analyses in RFX models. There didn't seem to be any kind of consensus so
I'm wondering if there is a correct method for doing these or whether it isn't
possible at all. Does anyone care to comment?
Finally, there are some other relevant papers:
Friston et al. (1999) Multi-subject fMRI studies and conjunction analyses,
NeuroImage, 10, 385-396.
Worsley & Friston (2000) A test for conjunction. Stat Probabil Lett,
47, 135-140.
These are the emails and papers which have helped me to understand
conjunctions and masking. I apologize if I missed other relevant info.
- Joe
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