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On Tue, 9 Aug 2005 01:37:54 +0100, Sherif Karama <[log in to unmask]> wrote: >Hello, > >A few years ago I came across the following design: > >ArArArArBrBrBrB > >with r being a 'baseline' condition while A and B were 'neutral' >and 'emotional' conditions, respectively (r=15 sec, A and B = 30 sec >each). The rationale of the authors was that they wanted to avoid having >condition A contaminated by condition B (assuming it could happen if a >block or blocks of B were to be placed before a block of A during a given >run). > >Is there anything wrong with this design (e.g. is it susceptible to low >frequency noise? Is it sub-optimal for some other reason?). Find attached some code I wrote showing that A-B is confounded with low- frequency noise. > >Thank you in advance, > >Sherif >=========================================================================