REPEATED MEASURES ANOVA for the analysis of ERP data 15th, April 2009 Advanced Statistics Seminar Natalia Egorova Outline • What data have we got? • What do we need to know about the repeated measures design? • Repeated Measures in SPSS 2 3 Within subject or Between subject? 54 subjects Between subject: 3 lists (18 subjects per list) Within subject: - Condition - Anteriority - Laterality + Time 4 Time – 3 levels • 180-320 ms • 350-550 ms • 550-750 ms 5 Condition – 2 levels Neutral condition: • Q: What happened? • A: The mayor praised the councillor and the alderman exuberantly. Violation condition: • Q: What did the mayor and the alderman do? • A: The mayor praised the councillor and the alderman exuberantly. 6 Order of analysis (localization) • Main electrode site • Frontal electrodes • Occipital electrodes 7 Anteriority – 3 levels 8 Laterality – 5 levels 9 Data in SPSS 10