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GSubject 1 --Stimulus (A) = 1050, Baseline (B) = 1000
å
å(1050/1000) * 100%  = 105% or   5% increase in IRF
å
GSubject 2 -- Stimulus (A) = 525, Baseline (B) = 500
å
å(525/500) * 100%  = 105% or       5% increase in IRF

åConclusion:
íBoth subjects show a 5% increase  in signal change from baseline to stimulus condition
íTherefore, no significant difference in signal change between these two subjects