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Hello I have carried out an ANCOVA in SPM2 in 2 groups and identified several clusters where GM is increased in gr1 compared to gr2. I would now like to investigate whether verbal fluency scores are correlated with GM in those areas where GM in gr1 is decreased. Is it possible to run a regression analysis only in the areas of GM difference. I thought this was analogous to masking - but in results I am only given the chioce of masking with other contrasts, in this case the results of the correlation not the ANCOVA. Any suggestion would be much appreciated. Best wishes Chiara __________________________________ Dr Chiara Nosarti PhD, Lecturer in Cognitive Neuropsychology, Division of Psychological Medicine, Room M5.01.05 Section of General Psychiatry, PO Box 63, Institute of Psychiatry 16 De Crespigny Park, Denmark Hill, London SE5 8AF, UK Tel: 0207 848 0133 Fax: 0207 701 9044