This may be considered to be due to a decrease or an increase in synchrony of the underlying neuronal populations, respectively. The former case is called as event-related desynchronization (ERD), and the latter as event-related synchronization (ERS).

• 其前者定义为事件相关去同步(event-related desynchronization, ERD),后者定义为事件相关同步(event-related synchronization, ERS)。