THE RELIABILITY OF EVENT-RELATED DESYNCHRONIZATION - A GENERALIZABILITY STUDY ANALYSIS

The aim of this study was to examine the spatio-temporal reliability o f EEG power during the baseline period of an event-related desynchroni sation (ERD) experiment. The data were analysed using ideas from gener alisability theory. The largest sources of variance were found to be a ssociated with differences between subjects (subject main effect), and to idiosyncratic topographical distributions (subject x electrode int eraction). The resulting spatio-temporal reliabilities exceeded 0.7, e xcept in theta and the absolute power values were relatively stable. O verall, this study gives further support for the reliability of quanti tative EEG measures in general and for the method of ERD in particular .