Factorial designs

PET (15)O techniques allowing for multiple measures of blood flow in single subjects (typically six to 12 scans) has enabled factorial designs to be implemented. In such a design two or more experimental variables are examined for effects on flow, alone and in combination. An example of this design would be a study where the influence of task A on flow activations induced by task B is examined. These factorial designs can be used to examine the modulatory influence of a psychotropic drug on psychological processes/!,5)

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